Elmer Ephraim Ellsworth (April 11, 1837 – May 24, 1861) was a law clerk and United States Army soldier who was the first conspicuous casualty and the first Union officer to die in the American Civil War.
He was killed while removing a Confederate flag from the roof of the Marshall House inn in Alexandria, Virginia.Before the war, Ellsworth led a touring military drill team, the "Zouave Cadets of Chicago".
He was a close personal friend of Abraham Lincoln, who as President later eulogized him as "the greatest little man I ever met".
After his death, Ellsworth's body lay in state at the White House.
The phrase, "Remember Ellsworth", became a rallying cry and tool for recruiting Union soldiers.