The final event before the outbreak of the Civil War took place at Fort Sumter on the 12th April 1861.
Fort Sumter is situated on an island off the coast from the city of Charleston, South Carolina. South Carolina was one of the states that had seceded and formed the Confederate.
The Fort however was occupied by troops loyal to the United States. The Fort was running low on supplies so Lincoln ordered supplies to be sent by sea.
On the 12th April Confederate troops opened fire on the Fort. The following day, Fort Sumter surrendered. The Civil War had begun.