decimate

decimate – v - To destroy a great number or proportion of; to select by lot and kill every tenth person of.

Both sides, Union and Confederate, were decimated on the single bloodiest day in American history, September 17, 1862. The scene was the ridges and fields west of Antietam Creek near Sharpsburg, Maryland. There were over 23,000 casualties, more than the total casualties for the War of 1812, the Mexican War, and the Spanish-American War combined. A sorrowful day indeed.