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State and territory boundaries, 1864–5.
Union states
Union territories
Kansas, entered Union as a free state
Union border states that permitted slavery
The Confederacy

Union territories that permitted slavery

The Union states
Twenty-three states remained loyal to the Union: California, Connecticut, Delaware, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Oregon, Pennsylvania, Rhode Island, Vermont, and Wisconsin. During the war, Nevada and West Virginia joined as new states of the Union. Tennessee and Louisiana were returned to Union control early in the war.

The territories of Colorado, Dakota, Nebraska, Nevada, New Mexico, Utah, and Washington fought on the Union side. Several slave-holding Native American tribes supported the Confederacy, giving the Indian territory (now Oklahoma) a small bloody civil war.

Border states
Main article: Border states (Civil War)
The Border states in the Union were West Virginia (which was separated from Virginia and became a new state), and four of the five northernmost slave states (Maryland, Delaware, Missouri, and Kentucky).

Maryland had numerous pro-Confederate officials who tolerated anti-Union rioting in Baltimore and the burning of bridges. Lincoln responded with martial law and called for troops. Militia units that had been drilling in the North rushed toward Washington and Baltimore. Before the Confederate government realized what was happening, Lincoln had seized firm control of Maryland (and the separate District of Columbia), by arresting all the Maryland government members and holding them without trial.

In Missouri, an elected convention on secession voted decisively to remain within the Union. When pro-Confederate Governor Claiborne F. Jackson called out the state militia, it was attacked by federal forces under General Nathaniel Lyon, who chased the governor and the rest of the State Guard to the southwestern corner of the state. (See also: Missouri secession). In the resulting vacuum, the convention on secession reconvened and took power as the Unionist provisional government of Missouri.

Kentucky did not secede; for a time, it declared itself neutral. However, the Confederates broke the neutrality by seizing Columbus, Kentucky in September 1861. That turned opinion against the Confederacy, and the state reaffirmed its loyal status, while trying to maintain slavery. During a brief invasion by Confederate forces, Confederate sympathizers organized a secession convention, inaugurated a governor, and gained recognition from the Confederacy. The rebel government soon went into exile and never controlled the state.

After Virginia's 1861 declaration of secession from the U.S., Union supporters in fifty counties of northwestern Virginia voted on October 24, 1861 to approve the creation of the new state of West Virginia. The majority of the voters in what was to become West Virginia had voted against Virginia’s secession, although twenty six of the fifty counties had pro-secession majorities. About half of West Virginia's soldiers were Confederate. This new state was admitted to the Union on June 20, 1863.

Similar Unionist secessions attempts appeared in East Tennessee, but were suppressed by the Confederacy. Jefferson Davis arrested over 3000 men suspected of being loyal to the Union and held them without trial.

Overview
A Roman Catholic Union army chaplain celebrating a MassOver 10,000 military engagements took place during the war, 40% of them in Virginia and Tennessee. Since separate articles deal with every major battle and many minor ones, this article only gives the broadest outline. For more information see List of American Civil War battles and Military leadership in the American Civil War.

The war begins
For more details on this topic, see Battle of Fort Sumter
Lincoln's victory in the presidential election of 1860 triggered South Carolina's declaration of secession from the Union. By February 1861, six more Southern states made similar declarations. On February 7, the seven states adopted a provisional constitution for the Confederate States of America and established their temporary capital at Montgomery, Alabama. A pre-war February Peace Conference of 1861 met in Washington in a failed attempt at resolving the crisis. The remaining eight slave states rejected pleas to join the Confederacy. Confederate forces seized most of the Federal forts within their boundaries (they did not take Fort Sumter); President Buchanan protested but made no military response aside from a failed attempt to resupply Fort Sumter via the ship Star of the West (the ship was fired upon by Citadel cadets), and no serious military preparations. However, governors in Massachusetts, New York, and Pennsylvania quietly began buying weapons and training militia units.

On March 4, 1861, Abraham Lincoln was sworn in as President. In his inaugural address, he argued that the Constitution was a more perfect union than the earlier Articles of Confederation and Perpetual Union, that it was a binding contract, and called any secession "legally void". He stated he had no intent to invade Southern states, nor did he intend to end slavery where it existed, but that he would use force to maintain possession of federal property. His speech closed with a plea for restoration of the bonds of union.

The South sent delegations to Washington and offered to pay for the federal properties and enter into a peace treaty with the United States. Lincoln rejected any negotiations with Confederate agents on the grounds that the Confederacy was not a legitimate government, and that making any treaty with it would be tantamount to recognition of it as a sovereign government. However, Secretary of State William Seward engaged in unauthorized and indirect negotiations that failed.

Fort Sumter in Charleston, South Carolina, Fort Monroe, Fort Pickens and Fort Taylor were the remaining Union-held forts in the Confederacy, and Lincoln was determined to hold Fort Sumter. Under orders from Confederate President Jefferson Davis, troops controlled by the Confederate government under P. G. T. Beauregard bombarded the fort with artillery on April 12, forcing the fort's capitulation. Northerners rallied behind Lincoln's call for all of the states to send troops to recapture the forts and to preserve the Union. With the scale of the rebellion apparently small so far, Lincoln called for 75,000 volunteers for 90 days. For months before that, several Northern governors had discreetly readied their state militias; they began to move forces the next day.

Four states in the upper South (Tennessee, Arkansas, North Carolina, and Virginia), which had repeatedly rejected Confederate overtures, now refused to send forces against their neighbors, declared their secession, and joined the Confederacy. To reward Virginia, the Confederate capital was moved to Richmond. The city was the symbol of the Confederacy; if it fell, the new nation would lose legitimacy. Richmond was in a highly vulnerable location at the end of a tortuous Confederate supply line. Although Richmond was heavily fortified, supplies for the city would be reduced by Sherman's capture of Atlanta and cut off almost entirely when Grant besieged Petersburg and its railroads that supplied the Southern capital.

Anaconda Plan and blockade, 1861
1861 cartoon of Scott's "Anaconda Plan"Winfield Scott, the commanding general of the U.S. Army, devised the Anaconda Plan to win the war with as little bloodshed as possible. His idea was that a Union blockade of the main ports would weaken the Confederate economy; then the capture of the Mississippi River would split the South. Lincoln adopted the plan, but overruled Scott's warnings against an immediate attack on Richmond.

In May 1861, Lincoln enacted the Union blockade of all Southern ports, ending most international shipments to the Confederacy. Violators' ships and cargos could be seized and were often not covered by insurance. By late 1861, the blockade stopped most local port-to-port traffic. The blockade shut down King Cotton, ruining the Southern economy. British investors built small, fast "blockade runners" that traded arms and luxuries from Bermuda, Cuba and the Bahamas in return for high-priced cotton and tobacco. When captured, the blockade runners and cargo were sold and the proceeds given to the Union sailors, but the British crews were released. Shortages of food and other goods triggered by the blockade, foraging by Northern armies, and the impressment of crops by Confederate armies combined to cause hyperinflation and bread riots in the South.

On March 8, 1862, the Confederate Navy waged a fight against the Union Navy when the ironclad CSS Virginia attacked the blockade; it seemed unstoppable but the next day it had to fight the new Union warship USS Monitor in the Battle of the Ironclads. The battle ended in a draw, which was a strategic victory for the Union in that the blockade was sustained. The Confederacy lost the CSS Virginia when the ship was scuttled to prevent capture, and the Union built many copies of the USS Monitor. Lacking the technology to build effective warships, the Confederacy attempted to obtain warships from Britain. The Union victory at the Second Battle of Fort Fisher in January 1865 closed the last useful Southern port and virtually ended blockade running.

Eastern Theater 1861–1863
For more details on this topic, see Eastern Theater of the American Civil War.

A Union Regimental Fife and Drum CorpsBecause of the fierce resistance of a few initial Confederate forces at Manassas, Virginia, in July 1861, a march by Union troops under the command of Maj. Gen. Irvin McDowell on the Confederate forces there was halted in the First Battle of Bull Run, or First Manassas, whereupon they were forced back to Washington, D.C., by Confederate troops under the command of Generals Joseph E. Johnston and P. G. T. Beauregard. It was in this battle that Confederate General Thomas Jackson received the nickname of "Stonewall" because he stood like a stone wall against Union troops. Alarmed at the loss, and in an attempt to prevent more slave states from leaving the Union, the U.S. Congress passed the Crittenden-Johnson Resolution on July 25 of that year, which stated that the war was being fought to preserve the Union and not to end slavery.

Maj. Gen. George B. McClellan took command of the Union Army of the Potomac on July 26 (he was briefly general-in-chief of all the Union armies, but was subsequently relieved of that post in favor of Maj. Gen. Henry W. Halleck), and the war began in earnest in 1862. Upon the strong urging of President Lincoln to begin offensive operations, McClellan attacked Virginia in the spring of 1862 by way of the peninsula between the York River and James River, southeast of Richmond. Although McClellan's army reached the gates of Richmond in the Peninsula Campaign, Johnston halted his advance at the Battle of Seven Pines, then General Robert E. Lee and top subordinates James Longstreet and Stonewall Jackson defeated McClellan in the Seven Days Battles and forced his retreat. The Northern Virginia Campaign, which included the Second Battle of Bull Run, ended in yet another victory for the South. McClellan resisted General-in-Chief Halleck's orders to send reinforcements to John Pope's Union Army of Virginia, which made it easier for Lee's Confederates to defeat twice the number of combined enemy troops.

Emboldened by Second Bull Run, the Confederacy made its first invasion of the North, when General Lee led 45,000 men of the Army of Northern Virginia across the Potomac River into Maryland on September 5. Lincoln then restored Pope's troops to McClellan. McClellan and Lee fought at the Battle of Antietam near Sharpsburg, Maryland, on September 17, 1862, the bloodiest single day in United States military history. Lee's army, checked at last, returned to Virginia before McClellan could destroy it. Antietam is considered a Union victory because it halted Lee's invasion of the North and provided an opportunity for Lincoln to announce his Emancipation Proclamation.

Confederate dead behind the stone wall of Marye's Heights, Fredericksburg, Virginia, killed during the Battle of Chancellorsville, May 1863When the cautious McClellan failed to follow up on Antietam, he was replaced by Maj. Gen. Ambrose Burnside. Burnside was soon defeated at the Battle of Fredericksburg on December 13, 1862, when over twelve thousand Union soldiers were killed or wounded during repeated futile frontal assaults against Marye's Heights. After the battle, Burnside was replaced by Maj. Gen. Joseph Hooker. Hooker, too, proved unable to defeat Lee's army; despite outnumbering the Confederates by more than two to one, he was humiliated in the Battle of Chancellorsville in May 1863. He was replaced by Maj. Gen. George Meade during Lee's second invasion of the North, in June. Meade defeated Lee at the Battle of Gettysburg (July 1 to July 3, 1863), the bloodiest battle of the war, which is sometimes considered the war's turning point. Pickett's Charge on July 3 is often recalled as the high-water mark of the Confederacy, not just because it signaled the end of Lee's plan to pressure Washington from the north, but also because Vicksburg, Mississippi, the key stronghold to control of the Mississippi, fell the following day. Lee's army suffered 28,000 casualties (versus Meade's 23,000). However, Lincoln was angry that Meade failed to intercept Lee's retreat, and after Meade's inconclusive Fall campaign, Lincoln decided to turn to the Western Theater for new leadership.

Western Theater 1861–1863
While the Confederate forces had numerous successes in the Eastern theater, they were defeated many times in the West. They were driven from Missouri early in the war as a result of the Battle of Pea Ridge. Leonidas Polk's invasion of Columbus, Kentucky ended Kentucky's policy of neutrality and turned that state against the Confederacy.

Nashville, Tennessee, fell to the Union early in 1862. Most of the Mississippi was opened with the taking of Island No. 10 and New Madrid, Missouri, and then Memphis, Tennessee. The Union Navy captured New Orléans without a major fight in May 1862, allowing the Union forces to begin moving up the Mississippi as well. Only the fortress city of Vicksburg, Mississippi, prevented unchallenged Union control of the entire river.

General Braxton Bragg's second Confederate invasion of Kentucky ended with a meaningless victory over Maj. Gen. Don Carlos Buell at the Battle of Perryville, although Bragg was forced to end his attempt at liberating Kentucky and retreat due to lack of support for the Confederacy in that state. Bragg was narrowly defeated by Maj. Gen. William Rosecrans at the Battle of Stones River in Tennessee.

The one clear Confederate victory in the West was the Battle of Chickamauga. Bragg, reinforced by Lt. Gen. James Longstreet's corps (from Lee's army in the east), defeated Rosecrans, despite the heroic defensive stand of Maj. Gen. George Henry Thomas. Rosecrans retreated to Chattanooga, which Bragg then besieged.

The Union's key strategist and tactician in the West was Maj. Gen. Ulysses S. Grant, who won victories at Forts Henry and Donelson, by which the Union seized control of the Tennessee and Cumberland Rivers; the Battle of Shiloh; the Battle of Vicksburg, cementing Union control of the Mississippi River and considered one of the turning points of the war. Grant marched to the relief of Rosecrans and defeated Bragg at the Third Battle of Chattanooga, driving Confederate forces out of Tennessee and opening a route to Atlanta and the heart of the Confederacy.

Trans-Mississippi Theater 1861–1865
Guerrilla activity turned much of Missouri into a battleground. Missouri had, in total, the third most battles of any state during the war. The other states of the west, though geographically isolated from the battles to the east, had a few small-scale military actions take place. Confederate incursions into Arizona and New Mexico were repulsed in 1862. Late in the war, the Union Red River Campaign was a failure. Texas remained in Confederate hands throughout the war, but was cut off from the rest of the Confederacy after the capture of Vicksburg in 1863 gave the Union control of the Mississippi River.

End of the war 1864–1865
Jefferson Davis, first and only President of the Confederate States of AmericaAt the beginning of 1864, Lincoln made Grant commander of all Union armies. Grant made his headquarters with the Army of the Potomac, and put Maj. Gen. William Tecumseh Sherman in command of most of the western armies. Grant understood the concept of total war and believed, along with Lincoln and Sherman, that only the utter defeat of Confederate forces and their economic base would bring an end to the war. This was total war not in terms of killing civilians but rather in terms of destroying homes, farms and railroad tracks. Grant devised a coordinated strategy that would strike at the entire Confederacy from multiple directions: Generals George Meade and Benjamin Butler were ordered to move against Lee near Richmond; General Franz Sigel (and later Philip Sheridan) were to attack the Shenandoah Valley; General Sherman was to capture Atlanta and march to the sea (the Atlantic Ocean); Generals George Crook and William W. Averell were to operate against railroad supply lines in West Virginia; and Maj. Gen. Nathaniel P. Banks was to capture Mobile, Alabama.

Union forces in the East attempted to maneuver past Lee and fought several battles during that phase ("Grant's Overland Campaign") of the Eastern campaign. Grant's battles of attrition at the Wilderness, Spotsylvania, and Cold Harbor resulted in heavy Union losses, but forced Lee's Confederates to fall back again and again. An attempt to outflank Lee from the south failed under Butler, who was trapped inside the Bermuda Hundred river bend. Grant was tenacious and, despite astonishing losses (over 65,000 casualties in seven weeks), kept pressing Lee's Army of Northern Virginia back to Richmond. He pinned down the Confederate army in the Siege of Petersburg, where the two armies engaged in trench warfare for over nine months.

Grant finally found a commander, General Philip Sheridan, aggressive enough to prevail in the Valley Campaigns of 1864. Sheridan defeated Maj. Gen. Jubal A. Early in a series of battles, including a final decisive defeat at the Battle of Cedar Creek. Sheridan then proceeded to destroy the agricultural base of the Shenandoah Valley, a strategy similar to the tactics Sherman later employed in Georgia.

Meanwhile, Sherman marched from Chattanooga to Atlanta, defeating Confederate Generals Joseph E. Johnston and John Bell Hood along the way. The fall of Atlanta, on September 2, 1864, was a significant factor in the reelection of Lincoln as president. Hood left the Atlanta area to menace Sherman's supply lines and invade Tennessee in the Franklin-Nashville Campaign. Union Maj. Gen. John M. Schofield defeated Hood at the Battle of Franklin, and George H. Thomas dealt Hood a massive defeat at the Battle of Nashville, effectively destroying Hood's army.

A dead soldier in Petersburg, Virginia 1865, photographed by Thomas C. Roche.Leaving Atlanta, and his base of supplies, Sherman's army marched with an unknown destination, laying waste to about 20% of the farms in Georgia in his "March to the Sea". He reached the Atlantic Ocean at Savannah, Georgia in December 1864. Sherman's army was followed by thousands of freed slaves; there were no major battles along the March. Sherman turned north through South Carolina and North Carolina to approach the Confederate Virginia lines from the south, increasing the pressure on Lee's army.

Lee's army, thinned by desertion and casualties, was now much smaller than Grant's. Union forces won a decisive victory at the Battle of Five Forks on April 1, forcing Lee to evacuate Petersburg and Richmond. The Confederate capital fell to the Union XXV Corps, composed of black troops. The remaining Confederate units fled west and after a defeat at Sayler's Creek, it became clear to Robert E. Lee that continued fighting against the United States was both tactically and logistically impossible.

Lee surrendered his Army of Northern Virginia on April 9, 1865, at Appomattox Court House. In an untraditional gesture and as a sign of Grant's respect and anticipation of folding the Confederacy back into the Union with dignity and peace, Lee was permitted to keep his officer's saber and his horse, Traveller. Johnston surrendered his troops to Sherman on April 26, 1865, in Durham, North Carolina. On June 23, 1865, at Fort Towson in the Choctaw Nations' area of the Oklahoma Territory, Stand Watie signed a cease-fire agreement with Union representatives, becoming the last Confederate general in the field to stand down. The last Confederate naval force to surrender was the CSS Shenandoah on November 4, 1865, in Liverpool, England.