Lincoln was deeply saddened by his friend's death and ordered an honor guard to bring his friend's body to the White House, where it lay in state in the East Room, on May 24, 1861. Ellsworth was then taken to the City Hall in New York City, where thousands of Union supporters came to see the first man to fall for the Union cause. Ellsworth was then buried in his hometown of Mechanicville, New York, in the Hudson View Cemetery.

Thousands of Union supporters rallied around Ellsworth's cause and enlisted. "Remember Ellsworth" was a patriotic slogan and a New York regiment of volunteers (the 44th New York Volunteer Infantry Regiment) called itself the "Ellsworth Avengers", as well as "The People's Ellsworth Regiment."

Rallied around "Ellsworth's cause"? How macabre!