- Operation Trident was launched against Pakistan on 4th December, 1971
- 4th December is celebrated as Navy Day
- During the 1971 India-Pakistan war, the Indian Navy had played a significant role in the bombing of the Karachi harbour, the stronghold of the Pakistani Navy.
- In this attack, Indian Navy sank four Pakistani vessels and ravaged the Karachi harbour fuel fields.
- Operation Trident had also resulted in first use of anti-ship missiles in the Arabian Sea region.