He was injured when a gun went off prematurely on April 14, 1861, during a 100-gun salute to the flag after the Battle of Fort Sumter.

[1] Galloway served as a private in Battery E of the 1st United States Artillery Regiment.

[5] Galloway was severely wounded by the explosion, and was taken after the salute to the Gibbes Hospital in Charleston where he died five days later.

[2][6] There are several variations of his surname; the United States Registers of Enlistments in the U.S. Army, 1798–1914 recorded his name as Edward Gallwey.

[7] His brother, who was mortally wounded at Port Hudson and died in Baton Rouge on July 9, 1863, was Major Andrew Power Gallwey.