The US Civil War began on 12 April 1861 at 4:30 am when confederate forces in Charleston, south Carolina, fired on Union forces holding Fort Sumter, which was located in Charleston Harbor. The bombardment lasted 34 hours and resulted in Union evacuation of the Fort. One Union soldier died after the battle while firing a cannon salute as part of the evacuation. One Confederate soldier bled to death after being wounded by a misfiring cannon during the battle.
Although most of the Confederate states had declared their secession from the Union before the Battle of Ft. Sumter, no shots had been fired, the mail continued to be delivered in both directions, as did telegraph messages and rail service. After Sumter was captured, the Union increased its military strength to recapture the fort, so the war continued and expanded.
A moment of silence would be appropriate in rememberance of all who fell in that terrible campaign that would go on for 4 more years.