8.3 Secession, Military Campaigns & Civil War Strategy (1861–1865)

When Abraham Lincoln took the oath of office on March 4, 1861, he delivered a firm but conciliatory First Inaugural Address, declaring that the Union was perpetual and that he would not initiate conflict, but insisted he would "hold, occupy, and possess" all federal property in seceded states. The crisis reached its breaking point at Fort Sumter, a federal garrison standing in the harbor of Charleston, South Carolina. Low on food and supplies, the fort's commander, Major Robert Anderson, informed Washington that he would soon be forced to surrender.

Lincoln faced an agonizing decision. Reinforcing the fort militarily would provoke war, while evacuating it would recognize Confederate legitimacy. Lincoln chose a brilliant middle path: he notified South Carolina Governor Francis Pickens that he was sending an unarmed supply ship with provisions only—no troops, arms, or ammunition. Confederate President Jefferson Davis ordered General P.G.T. Beauregard to demand Fort Sumter's immediate surrender. When Anderson refused, Confederate batteries opened fire at 4:30 a.m. on April 12, 1861. After a 34-hour bombardment, Anderson surrendered the fort.

The attack on Fort Sumter ignited immense Northern patriotism. On April 15, Lincoln issued a call for 75,000 state militia volunteers for 90 days to suppress the insurrection. Lincoln's call to arms forced the states of the Upper South to choose sides. Four states—Virginia, North Carolina, Tennessee, and Arkansas—seceded and joined the Confederacy. The Confederate capital was subsequently moved from Montgomery to Richmond, Virginia.

Crucial to Union victory was Lincoln's successful retention of the four strategic Border States: Maryland, Kentucky, Missouri, and Delaware (along with West Virginia, which broke away from Virginia in 1861 and entered the Union in 1863). The Border States were slaveholding states that remained loyal to the Union. Their strategic importance was enormous:

• Maryland surrounded Washington, D.C., on three sides.
• Kentucky controlled the Ohio River and key invasion routes into the South.
• Missouri controlled access to the Mississippi River and western territories.

To retain these states, Lincoln employed decisive, sometimes extraordinary executive measures. In Maryland, he suspended the writ of habeas corpus, placed Baltimore under martial law, and imprisoned pro-Confederate state legislators. In Missouri, federal troops engaged in brutal guerilla warfare against Confederate sympathizers. Lincoln moved cautiously on slavery early in the war to avoid alienating Border State slaveholders, famously declaring: "I think to lose Kentucky is nearly the same as to lose the whole game."

Strategic Blueprints: The Anaconda Plan vs. Confederate Defense

The opposing sides entered the war with vastly different resources and strategic objectives:

Union Disproportionality & Resources

• Population: 22 million in 23 Northern states vs. 9 million in 11 Confederate states (3.5 million of whom were enslaved).
• Industrial & Financial Capacity: The North produced 90% of the nation's manufactured goods, 93% of its pig iron, and possessed 70% of total railroad mileage, along with a functional navy and established banking credit.

Confederate Strategic Advantages

• Defensive War: The South was fighting a defensive struggle on familiar terrain with interior lines of communication. To win independence, the Confederacy did not need to conquer the North; it only needed to resist Union invasion long enough to exhaust Northern political willpower.
• Military Leadership: The South boasted exceptional military commanders, including Robert E. Lee, Thomas "Stonewall" Jackson, and J.E.B. Stuart.
• King Cotton Diplomacy: Southern leaders believed European dependence on Southern raw cotton would compel Great Britain and France to grant diplomatic recognition and naval assistance.

Union Strategy: The Anaconda Plan

Formulated by veteran General-in-Chief Winfield Scott, the Union's overarching strategy was named the Anaconda Plan because it sought to slowly crush the Confederacy like a giant snake. The strategy had three main components:

1. Naval Blockade: Deploy the U.S. Navy to seal off 3,500 miles of Southern coastline, preventing cotton exports and manufactured imports.
2. Control of the Mississippi River: Drive military forces down the Mississippi River Valley to split the Confederacy into two isolated halves (severing TX, AR, LA from the rest).
3. Capture Richmond: Launch direct campaigns in the Eastern Theater to capture the Confederate capital and break the Southern military apparatus.

Key Campaigns & Strategic Battles (1861–1863)

• First Battle of Bull Run (Manassas, July 1861): The first major battle occurred 30 miles outside Washington. Union forces were routed after Jackson's brigade held firm ("Stonewall"). The defeat shattered Northern illusions of a quick 90-day victory.
• Battle of Shiloh (April 1862, TN): In the Western Theater, Union General Ulysses S. Grant won a costly victory near Pittsburg Landing, demonstrating that the Western campaign would be a long, brutal contest of attrition (23,000 casualties).
• Battle of Antietam (Sharpsburg, MD, September 17, 1862): General Lee launched his first invasion of Northern territory. Union General George B. McClellan intercepted Lee's army. Antietam became the bloodiest single day in American military history, resulting in over 23,000 casualties. Although tactically a draw, Lee was forced to retreat to Virginia. This strategic Union victory gave Lincoln the political momentum to issue the Preliminary Emancipation Proclamation.
• Battle of Gettysburg (July 1–3, 1863, PA): Lee launched a second invasion into Pennsylvania, hoping to score a victory on Northern soil that would force peace talks. Over three grueling days, Union General George G. Meade defended the high ground around Gettysburg. The climax, Pickett's Charge, resulted in the slaughter of thousands of Confederate soldiers charging open fields against fortified artillery. Lee retreated, having suffered 28,000 casualties (~one-third of his army). Gettysburg marked the "high-water mark of the Confederacy."
• Siege of Vicksburg (May–July 4, 1863, MS): Simultaneously in the West, Grant conducted a brilliant campaign to capture the impregnable Confederate fortress of Vicksburg, commanding the Mississippi River. After a 47-day siege that forced residents to live in caves and eat rats, Vicksburg surrendered on July 4, 1863. The victory gave the Union total control of the Mississippi River and split the Confederacy in two.

Total War, Attrition, and Appomattox (1864–1865)

In March 1864, Lincoln appointed Ulysses S. Grant as General-in-Chief of all Union armies. Grant devised a coordinated national strategy of relentless, simultaneous pressure against all Confederate forces. In the East, Grant engaged Lee's Army of Northern Virginia in the brutal Overland Campaign (Wilderness, Spotsylvania, Cold Harbor), taking heavy casualties but refusing to retreat, forcing Lee into a nine-month siege at Petersburg, the supply conduit for Richmond.

In the West, General William Tecumseh Sherman captured the vital industrial and railway hub of Atlanta in September 1864. Atlanta's fall provided a massive political boost to Lincoln, ensuring his re-election in November 1864 against Democratic candidate George McClellan.

Following Atlanta, Sherman embarked on his famous March to the Sea (November–December 1864), cutting a 60-mile-wide swath of destruction across Georgia to Savannah. Operating without supply lines, Sherman practiced "total war" (or hard war), destroying infrastructure, tearing up railroad tracks ("Sherman's neckties"), burning crops, and confiscating livestock. Sherman aimed not merely to defeat Confederate armies, but to break the physical and psychological capacity of the Southern civilian population to sustain war.

By April 1865, Lee's weakened lines at Petersburg broke, forcing the evacuation of Richmond. Grant pursued Lee's retreating army westward. Surrounded and outmaneuvered, Lee surrendered the Army of Northern Virginia to Grant at Appomattox Court House on April 9, 1865. Grant offered generous surrender terms: Confederate soldiers turned in their arms, were paroled without treason prosecution, and were allowed to keep their horses and sidearms for spring planting. Within weeks, the remaining Confederate forces surrendered, bringing the Civil War to an end.