The American Civil War was triggered by slavery. As the West opened up, a growing abolitionist movement in the North refused to allow the spread of slavery to new states like Kansas. When the mildly abolitionist Republican Party candidate Abraham Lincoln was elected President in 1860, 11 southern states, their economies largely dependent on cotton harvested by enslaved African Americans, seceded from the Union and formed a Confederacy.
Lincoln began the war without a large army. Many of its Southern-born officers put loyalty to their native states first and resigned their US commissions to serve the Confederacy.
Lincoln appealed for 75,000 volunteers to preserve the Union. But the first major clash between North and South at Bull Run/Manassas in July 1861 was a disaster for the Union. The inexperienced Northern army was routed, its commander Irvin McDowell was sidelined, and with Washington itself threatened, the search was on for a competent general to save the Union and its capital.






![LEFT The Charge of the Light Brigade and [inset] one of the men who charged: Cornet John Wilkin of the 11th Hussars, photographed by Roger Fenton.](https://i0.wp.com/the-past.com/wp-content/uploads/2023/01/post-1_image6-15.jpg?fit=768%2C429&ssl=1)

War Classics – The Fifteen Decisive Battles of the World: From Marathon to Waterloo