The March 4 incident in the Indian Ocean marked the first time an American submarine had torpedoed an enemy vessel since the last days of World War II.

The Torsk’s sinking of the Japanese vessel marked the last U.S. submarine kill for over eight decades — that is until March 3 ...

The downing of the Iranian frigate IRIS Dena marks the first time an American submarine has destroyed an enemy warship in decades.

A single Mk-48 torpedo achieved "immediate effect" on an Iranian frigate, which was operating in the Indian Ocean, the Pentagon confirmed.

Since 1991, Navy subs have launched scores of cruise missiles in combat, but the torpedo attack off Sri Lanka is a return to form after 80 years.