U.S. Sinks Iranian Warship IRIS Dena in Indian Ocean
On March 4, 2026, the United States Navy sunk the Iranian warship IRIS Dena in the Indian Ocean with a single Mark 48 torpedo, marking the first such sinking of an enemy ship since World War II. The Sri Lankan navy reported that the IRIS Dena went down in the Indian Ocean, with 140 people on board missing.
Date: March 4, 2026
Location: Indian Ocean, United States
Conflict: US-Iran Conflict
Category: ground battle
Severity: CRITICAL
Casualties reported: 140
Source: 2026 in the United States