Furious military action flared in both the eastern and western theaters. In the West, Union victories at forts Henry and Donelson in February and at Shiloh in April gave the Union control of the heartland of Tennessee. The Battle of Pea Ridge in March frustrated a Confederate effort to gain a hold in Missouri, and the capture of New Orleans in late April cost the Confederacy its largest city and busiest port. Confederates responded with an invasion of Kentucky in late summer and fall, which ended in failure at the Battle of Perryville in October. Heavy fighting for the year ended with the inconclusive battle of Stones River or Murfreesboro, Tennessee, and unsuccessful opening movements in the Union campaign to capture Vicksburg, Mississippi. In the East, a Confederate victory at the Seven Days Battle in late June and early July turned back a major threat to Richmond, followed by another Southern triumph at Second Bull Run in late August, and the Union's strategic success at Antietam in mid-September, which ended Robert E. Lee's first invasion of the North. The year closed in Virginia with a costly Union setback at Fredericksburg in mid-December. The year also saw the Confederacy enact the first national conscription act in American history, and the North place emancipation alongside unification as a second great war aim.

B. Minor Actions and Skirmishes

It would be a mistake to think of the Civil War only as a succession of major battles. Once the fighting was well under way, some kind of military action took place almost daily. The month of October 1862 was typical. Within its 31 days, two battles that resulted in heavy losses were fought. On October 3 and 4 the Confederates attacked Union forces holding Corinth, Mississippi. They were repulsed, but not until they had lost 4133 men killed, wounded, and prisoners, against a total Union loss of 2520 men. On October 8 Union and Confederate troops clashed in the Battle of Perryville, in Kentucky, and the casualties totaled 7600.

The same month saw smaller conflicts. One took place on the Hatchie River near Corinth, Mississippi, on October 5, and a chronicler describes the losses as merely ""heavy."" The next day, in a 30-minute conflict at La Vergne, Tennessee, the Confederates lost 25 men and a Union force lost 14. On October 10 and 11 the Confederate cavalry leader J. E. B. Stuart occupied Chambersburg, Pennsylvania, destroyed cars and engines belonging to the Cumberland Valley Railroad, and seized 500 horses and a large quantity of Union Army supplies. On October 18 Confederate cavalry commanded by General John Hunt Morgan dashed into Lexington, Kentucky, and took 125 prisoners. In an action at Labadieville on the Bayou Lafourche, in Louisiana, on October 27, the Confederates lost 6 killed, 15 wounded, and 208 taken prisoner, while the Union loss was reported as 18 killed and 74 wounded. The month of October 1862 also saw numerous reconnaissances and skirmishes in which only one or two men were killed or wounded, casualties too small to be reported.

It would also be a mistake to think of the Civil War as a steady series of military actions, large or small. The stubbornest enemy of every soldier was not his opponent, but inactivity and boredom. For every hour a man spent in action, he endured many days during which he did nothing but respond to the routine formations of reveille, mess call, and retreat or march mile after mile on expeditions that led nowhere.

As 1862 began, the Army of the Potomac remained inactive. McClellan, although still popular with his troops, was now subject to mounting criticism from an impatient administration and public. The phrase ""All quiet on the Potomac"" became a taunt.

C. Grant's Campaign in the West

On the western front, Grant waited for permission from his superior, Henry W. Halleck, to strike at the Confederates in Tennessee. Grant had picked his targets: Fort Henry on the Tennessee River; then Fort Donelson a few miles to the east on the Cumberland River. In January 1862 Halleck ordered the advance. It was to be a joint campaign with naval forces under the command of Flag Officer Andrew H. Foote. Foote's gunboats attacked Fort Henry on February 6. The fort surrendered before Grant's troops could be engaged. Fort Donelson proved to be a different story. Fighting began on February 12, but Fort Donelson held out until February 16. The two victories lifted spirits in the North, and Grant's demand for ""unconditional and immediate surrender"" in response to the Confederate commander's request for terms made the Union general famous.

The North, its elation heightened by a decisive Union victory in the Battle of Pea Ridge, also known as the Battle of Elkhorn Tavern, in Arkansas, on March 7 and 8, soon received more good news with a victory at Shiloh.

D. Battle of Shiloh

After taking Fort Donelson, Grant had wanted to move on the Confederate base in Corinth, Mississippi, where Albert Sidney Johnston, the Confederate commander in the West, was known to be assembling troops. Grant was ordered to delay his advance until Union General Don Carlos Buell, who had been operating in East Tennessee, could join him.

Early on Sunday, April 6, 1862, Johnston's army, which had come up to the federal lines undetected, struck Grant's army, which was encamped at Pittsburg Landing on the Tennessee River. The Battle of Shiloh followed. At the end of the second day of fighting the Union forces drove back the attackers. Shocking losses, 13,000 out of more than 62,000 Federals and 10,700 out of 40,000 Confederates, appalled both sections of the country. Although victorious, Grant was accused of lacking elementary caution and found himself reviled in the North. The South mourned the loss of Johnston, one of its ablest commanders, who was shot and bled to death.

E. Monitor and Virginia

In the spring of 1862, McClellan proposed to Lincoln that the North invade Virginia by way of the peninsula between the James and York rivers. However, an unexpected development in that area threatened to prevent the offensive. On March 8 the Confederate ironclad vessel, the Virginia, which was made from the salvaged Merrimack, entered Hampton Roads, Virginia, at the mouth of the James. A number of wooden men-of-war of the Union fleet were in the roads enforcing the blockade. The Virginia destroyed two ships and disabled another. The North was thrown into panic. The next morning, however, the Virginia was challenged by the Monitor, a Union ironclad. The two armored ships bounced shells off each other's sides for four hours without doing any serious damage. Although the battle ended in a draw, the Virginia no longer controlled the area's waters. Soon after, when the Confederates withdrew from Norfolk, they destroyed the Virginia to keep it from falling into Northern hands. McClellan continued with his plans for invading Virginia.