Section #1 - The American Civil War: 1861-65
Chapter 6: Troop Counts Are Momentarily Equal as Fighting Breaks Out
After Sumter, President Lincolns initially calls for 75,000 volunteers to sign up for a 3 month enlistment on the naïve assumption that the fighting will quickly be over. The Confederate meanwhile target 100,000 men.
But these figure will change dramatically in favor of the Union once the magnitude of the battles becomes apparent.