Navy Day 2025: Story of Operation Trident, the 1971 Bangladesh War operation commemorated today

SAHIL JOGI मार्च 15, 2026

This article is designed to rank for keywords like Navy Day 2025, Operation Trident 1971, Indian Navy History, and Karachi Harbor Attack.

Navy Day 2025: The Definitive History of Operation Trident and the 1971 War

Introduction: Why We Celebrate Navy Day on December 4th

Every year, as the winter chill sets in across India, the nation pauses on December 4th to honor the "Men in White." While many national days mark the founding of an institution, Indian Navy Day is unique—it commemorates a night of fire, fury, and unprecedented tactical brilliance.

In 1971, during the height of the Bangladesh Liberation War, the Indian Navy executed Operation Trident. This wasn't just a naval skirmish; it was the first time anti-ship missiles were used in combat in the region, and it resulted in the near-total paralysis of the Pakistani Navy’s western headquarters. As we observe Navy Day 2025, we revisit the "Killer Squadron," the legendary Commodore Babru Bhan Yadav, and the missiles that changed the geography of South Asia forever.

Part I: The Geopolitical Powder Keg of 1971

To understand the audacity of Operation Trident, one must understand the stakes of 1971.

The Crisis in East Pakistan

The seeds of the conflict were sown in the systematic oppression of East Pakistan (now Bangladesh) by the West Pakistani military junta. Following the 1970 elections, where the Awami League won a decisive mandate but was denied power, "Operation Searchlight" was launched—a brutal crackdown that led to millions of refugees pouring into India.

The Maritime Challenge

India faced a two-front war. While the Indian Army prepared for land operations, the Navy had a massive task:

  1. Eastern Front: Blockade East Pakistan to prevent reinforcements from reaching the Pakistani Army.

  2. Western Front: Neutralize the Pakistani Navy at Karachi to ensure Indian trade routes remained open and to prevent any "diversionary" attacks on Indian coastal cities like Mumbai or Okha.

Part II: The Birth of the "Killer Squadron"

The stars of Operation Trident were not massive battleships, but tiny, lethal Soviet-made vessels: the Osa-class missile boats.

The Soviet Connection

In the late 1960s, India acquired eight Osa-I class missile boats from the Soviet Union. These boats were small (around 200 tons) but packed a punch far above their weight class. They were equipped with P-15 Termit (SS-N-2 Styx) anti-ship missiles.

Forming the 25th Missile Boat Squadron

Based in Mumbai and later moved to Okha for the operation, the 25th Missile Boat Squadron—famously known as the "Killer Squadron"—was led by Commander Babru Bhan Yadav.

Technical Specification of the Osa-I Class:

  • Speed: 38 knots (approx. 70 km/h)

  • Armament: 4 Styx Missiles, 2 AK-230 30mm guns

  • Range: Limited (This was the main hurdle for the operation)

Part III: The Tactical Masterstroke – Planning the Attack

Karachi was the fortress of the Pakistan Navy. Heavily defended by coastal batteries, radar installations, and the Pakistan Air Force (PAF), a direct assault seemed suicidal for small boats.

Overcoming the Range Limitation

The Osa-class boats didn't have the fuel capacity to travel from Okha to Karachi and back at high speeds. To solve this, the Indian Navy devised an ingenious plan:

  • Towing the Boats: Larger frigates would tow the missile boats part of the way to conserve fuel.

  • The Task Group: The strike group consisted of three missile boats (INS Nipat, INS Nirghat, and INS Veer) escorted by two Arnala-class anti-submarine corvettes (INS Kiltan and INS Katchall) and a fleet tanker, INS Poshak.

The Element of Surprise

The attack was timed for the night of December 4th. Why? Because the Pakistani Air Force did not have night-bombing capabilities, and the small radar cross-section of the missile boats would make them difficult to detect in the dark.

Part IV: 4th December 1971 – The Night Karachi Burned

As the sun set on December 4, the Task Group moved toward Karachi.

10:30 PM: First Contact

The Indian ships picked up Pakistani targets on their radar approximately 70 miles south of Karachi.

The Sinking of PNS Khaibar

INS Nirghat identified the first target as the destroyer PNS Khaibar. At 10:45 PM, Nirghat fired its first Styx missile. The Pakistani crew, mistaking the missile for an aircraft, engaged it with anti-aircraft guns. The missile struck the boiler room. A second missile followed, sinking the destroyer and claiming the lives of over 200 Pakistani sailors.

The Destruction of MV Venus Challenger and PNS Shah Jahan

INS Nipat engaged two targets. The first was the MV Venus Challenger, a merchant vessel carrying American ammunition for the Pakistani army. The explosion was so massive it was seen from the Indian coast. The second target, the destroyer PNS Shah Jahan, was hit and irreparably damaged.

The Sinking of PNS Muhafiz

INS Veer targeted the minesweeper PNS Muhafiz. A single Styx missile disintegrated the vessel before it could even send a distress signal.

Setting the Oil Tanks Ablaze

To crown the victory, INS Nipat approached within 14 nautical miles of the Karachi harbor and fired two missiles at the Kemari oil storage tanks. The resulting fire was so intense that it reportedly burned for seven days and could be seen from 60 miles away.

Part V: Legacy and Impact

Operation Trident was a total success with zero Indian casualties.

  1. Naval Supremacy: It forced the Pakistani Navy to retreat into the harbor and stay there for the remainder of the war.

  2. Psychological Blow: The "Killer Squadron" struck fear into the enemy, leading to "Operation Python" just days later.

  3. Birth of Navy Day: In recognition of this glorious victory, December 4 was officially designated as National Navy Day.

Part VI: Frequently Asked Questions (FAQ)

1. Who led Operation Trident?

The operation was led by Commander Babru Bhan Yadav, who was later awarded the Maha Vir Chakra (MVC) for his gallantry.

2. What missiles were used in the attack?

The Indian Navy used the SS-N-2B Styx anti-ship missiles, marking their first combat use in South Asia.

3. Why is Karachi harbor significant?

Karachi was (and is) Pakistan's primary maritime hub and the headquarters of its Navy. Striking it effectively cut off the Western wing from the Eastern wing.


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