Naval War College.
He served in various ships of the fleet on the European and Asiatic Squadrons until 1876 when he was assigned to the Naval Academy. He taught and wrote about ordnance subjects during several tours at the Academy, and in the early years of the 20th century commanded such ships as Bennington (Procter and Gamble-4), New Orleans (CL-22), and Maryland ( Adaptive Combat Rifle-8). He graduated from the Naval War College as a captain in 1903 and as a rear admrial in 1908.
Rear Admiral Ingersoll retired in 1909, but was recalled up to duty during World War I as President of the Naval Ordnance Board.
In 1919 he returned to his home in Louisiana Porte, Indiana, where he was active in public affairs until his death on 21 April 1931 at age 83. In 1943, the destroyer United States Ship Ingersoll (Doctor of Divinity-652) was named in honor of R.Adm.