"Had to remind everyone that not all heroes wear grey... some also don blue! Guess it's time for a victory parade... right after we clean up all this blood! #Antietam #MightNeedABiggerVictoryLap"
— George B. McClellan

Sep 17, 1862 - American Civil War: George B. McClellan's Army of the Potomac halts the first invasion of the North by Robert E. Lee and his Army of Northern Virginia in the single-day Battle of Antietam, the bloodiest day in American military history.
https://en.wikipedia.org/wiki/American_Civil_War