Following the capture of Fort Sumter, both sides quickly began raising and organizing armies. On July 21, 1861, some 30,000 Union troops marching toward the Confederate capital of Richmond, Virginia, were stopped at Bull Run (Manassas) and then driven back to Washington, D.C., by Confederates under Gen. Thomas J. “Stonewall” Jackson and Gen. P.G.T. Beauregard. The shock of defeat galvanized the Union, which called for 500,000 more recruits. Gen. George B. McClellan was given the job of training the Union’s Army of the Potomac.

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The first major campaign of the war began in February 1862, when the Union general Ulysses S. Grant captured the Confederate strongholds of Fort Henry and Fort Donelson in western Tennessee; this action was followed by the Union general John Pope’s capture of New Madrid, Missouri, a bloody but inconclusive battle at Shiloh (Pittsburg Landing), Tennessee, on April 6–7, and the occupation of Corinth and Memphis, Tennessee, in June. Also in April, the Union naval commodore David G. Farragut gained control of New Orleans. In the East, McClellan launched a long-awaited offensive with 100,000 men in another attempt to capture Richmond. Opposed by Lee and his able lieutenants Jackson and J.E. Johnston, McClellan moved cautiously and in the Seven Days’ Battles (June 25–July 1) was turned back, his Peninsular Campaign a failure. At the Second Battle of Bull Run (August 29–30), Lee drove another Union army, under Pope, out of Virginia and followed up by invading Maryland. McClellan was able to check Lee’s forces at Antietam (or Sharpsburg, September 17). Lee withdrew, regrouped, and dealt McClellan’s successor, A.E. Burnside, a heavy defeat at Fredericksburg, Virginia, on December 13.

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Burnside was in turn replaced as commander of the Army of the Potomac by Gen. Joseph Hooker, who took the offensive in April 1863. He attempted to outflank Lee’s position at Chancellorsville, Virginia, but was completely outmaneuvered (May 1–5) and forced to retreat. Lee then undertook a second invasion of the North. He entered Pennsylvania, and a chance encounter of small units developed into a climactic battle at Gettysburg (July 1–3), where the new Union commander, Gen. George G. Meade, commanded defensive positions. Lee’s forces were repulsed at the Battle of Gettysburg and fell back into Virginia. At nearly the same time, a turning point was reached in the West. After two months of masterly maneuvering, Grant captured Vicksburg, Mississippi, on July 4, 1863. Soon the Mississippi River was entirely under Union control, effectively cutting the Confederacy in two. In October, after a Union army under Gen. W.S. Rosecrans had been defeated at Chickamauga Creek, Georgia (September 19–20), Grant was called to take command in that theater. Ably assisted by William Sherman and Gen. George Thomas, Grant drove Confederate general Braxton Bragg out of Chattanooga (November 23–25) and out of Tennessee; Sherman subsequently secured Knoxville.

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In March 1864 Lincoln gave Grant supreme command of the Union armies. Grant took personal command of the Army of the Potomac in the east and soon formulated a strategy of attrition based upon the Union’s overwhelming superiority in numbers and supplies. He began to move in May, suffering extremely heavy casualties in the battles of the Wilderness, Spotsylvania, and Cold Harbor, all in Virginia, and by mid-June he had Lee pinned down in fortifications before Petersburg, Virginia. For nearly 10 months the siege of Petersburg continued, while Grant slowly closed around Lee’s positions. Meanwhile, Sherman faced the only other Confederate force of consequence in Georgia. Sherman captured Atlanta early in September, and in November he set out on his 300-mile (480-km) march through Georgia, leaving a swath of devastation behind him. He reached Savannah on December 10 and soon captured that city.

By March 1865 Lee’s army was thinned by casualties and desertions and was desperately short of supplies. Grant began his final advance on April 1 at Five Forks, captured Richmond on April 3, and accepted Lee’s surrender at nearby Appomattox Court House on April 9. Sherman had moved north into North Carolina, and on April 26 he received the surrender of J.E. Johnston. The war was over.

Naval operations in the Civil War were secondary to the war on land, but there were nonetheless some celebrated exploits. Farragut was justly hailed for his actions at New Orleans and at Mobile Bay (August 5, 1864), and the battle of the ironclads Monitor and Merrimack (March 9, 1862) is often held to have opened the modern era of naval warfare. For the most part, however, the naval war was one of blockade as the Union attempted, largely successfully, to stop the Confederacy’s commerce with Europe.

Foreign affairs

Davis and many Confederates expected recognition of their independence and direct intervention in the war on their behalf by Great Britain and possibly France. But they were cruelly disappointed, in part through the skillful diplomacy of Lincoln, Secretary of State Seward, and the Union ambassador to England, Charles Francis Adams, and in part through Confederate military failure at a crucial stage of the war.

The Union’s first trouble with Britain came when Capt. Charles Wilkes halted the British steamer Trent on November 8, 1861, and forcibly removed two Confederate envoys, James M. Mason and John Slidell, bound for Europe. Only the eventual release of the two men prevented a diplomatic rupture with Lord Palmerston’s government in London. Another crisis erupted between the Union and England when the Alabama, built in the British Isles, was permitted upon completion to sail and join the Confederate navy, despite Adams’s protestations. And when word reached the Lincoln government that two powerful rams were being constructed in Britain for the Confederacy, Adams reputedly sent his famous “this is war” note to Palmerston, and the rams were seized by the British government at the last moment.

The diplomatic crisis of the Civil War came after Lee’s striking victory at the Second Battle of Bull Run in late August 1862 and subsequent invasion of Maryland. The British government was set to offer mediation of the war and, if this was refused by the Lincoln administration (as it would have been), forceful intervention on behalf of the Confederacy. Only a victory by Lee on Northern soil was needed, but he was stopped by McClellan in September at Antietam, the Union’s most needed success. The Confederate defeats at Gettysburg and Vicksburg the following summer ensured the continuing neutrality of Britain and France, especially when Russia seemed inclined to favor the Northern cause. Even the growing British shortage of cotton from the Southern states did not force Palmerston’s government into Davis’s camp, particularly when British consuls in the Confederacy were more closely restricted toward the close of the war. In the final act, even the Confederate offer to abolish slavery in early 1865 in return for British recognition fell on deaf ears.