Today in U.S. Naval History - April 10
1941 - USS Niblack, while rescuing survivors of torpedoed ship, depth charged German submarine; first action of WW II between U.S. and German navies
1963 - During diving tests, USS Thresher lost with all hands (112 crew and 17 civilians) east of Cape Cod, Mass.
1966 - River Patrol Boats of River Patrol Force commenced operations on inland waters of South Vietnam
For more information about naval history, visit the Naval History and Heritage Command website at history.navy.mil.