April 12, 2017 all-day
After months of escalating tension, Major Robert Anderson refused to evacuate Fort Sumter at Charleston, SC. Confederate troops under the command of General P.T. Beauregard opened fire on the harbor fort at 4: 30 AM and continued until Major Anderson surrendered on Apr 13. No lives were lost despite the firing of some 40,000 shells in the first major engagement of the American Civil War.
Image: Public Domain, Wikimedia Commons