Dashiell was commissioned as an ensign on July 1, 1883.[2][4] First assigned to the naval ordnance department,[5] he was transferred in 1885 to the USS Pensacola,[6] under the command of then-Captain George Dewey.[7] He served on the Pensacola until early 1888, when he was again assigned to naval ordnance.[2]
In May 1893, Dashiell was assigned to the armored cruiserUSS New York.[11] In December of that year, he was promoted to lieutenant junior grade.[11] In 1895, while still serving on the New York,[12] he resigned as a line officer and was appointed a staff corps officer in the Naval Construction Corps.[13] An inventor of important ordnance mechanisms and an authority on dock construction, he was commissioned Assistant Naval Constructor on February 7, 1895.[14]
Dashiell served in his specialty until his death due to meningitis in 1899 in Washington, D.C.[15] He was survived by his wife and three children.[15] A brother, Paul Dashiell, was a professor and football coach at the Naval Academy.[16] One of his daughters, Eleanor, married future Army major general Julian Hatcher in October 1910.[17] Another daughter, Nancy, married future Navy vice admiral Thomas Leigh Gatch in June 1917.[18]
In 1943, the destroyerUSS Dashiell (DD-659) was named in his honor.[19] The Dashiell was commissioned 20 March 1943 and decommissioned 29 April 1960.