How three Indian missile boats set Karachi harbour ablaze in 1971

Karachi was not a random target; it was the target. Almost all of Pakistan's naval strength was concentrated there, and the port handled the bulk of the country's seaborne trade and oil imports. Cripple Karachi and you cripple Pakistan's ability to keep its western fleet fighting and its economy fuelled. The Indian Navy also wanted to seize the initiative early: a bold first strike would push the Pakistani fleet into a defensive crouch, keeping it bottled up in harbour and unable to threaten India's own coast or shipping. There was a doctrine at work too. Admiral Nanda believed in taking the war to the enemy rather than waiting for it, and the missile boats offered a way to do that cheaply and by surprise, since Pakistan did not expect a missile attack from the sea. Timing mattered as well. The war in the east was moving fast toward Dhaka's fall, and a spectacular naval success in the west would boost morale and, crucially, deny Pakistan the fuel and ships it needed to prolong the fight. Hitting Karachi hard, and early, served every one of these aims at once.

Operation Trident's arithmetic is small and lethal. The strike group centred on three Vidyut-class missile boats — INS Nipat, INS Nirghat and INS Veer — of the 25th 'Killer' Missile Boat Squadron, each carrying four Soviet P-15 'Styx' (SS-N-2B) missiles with a range of about 40 nautical miles, roughly 75 kilometres. Screened by two anti-submarine corvettes, INS Kiltan and INS Katchall, and the fleet tanker INS Poshak, the boats fired their missiles on the night of 4–5 December 1971. INS Nirghat's second missile sank the destroyer PNS Khaibar; INS Veer sank the minesweeper PNS Muhafiz; INS Nipat destroyed the ammunition ship MV Venus Challenger and set the Kemari oil farm ablaze. Pakistani dead are often quoted at about 222 on Khaibar and 33 on Muhafiz, but these remain under-documented estimates. India lost nothing — zero boats, zero men, zero casualties. Four days later, on the night of 8–9 December, Operation Python struck Karachi again. In honour of the raid, India observes 4 December every year as Navy Day.

The genius of Operation Trident lay in how it solved the missile boats' biggest weakness: range. The Vidyut-class boats were short-legged coastal craft, and Karachi sat far across the Arabian Sea. So the Navy conserved every drop of fuel — the boats were escorted by the anti-submarine ships INS Kiltan and INS Katchall, which lent them better radar and sensors, while the fleet tanker INS Poshak trailed behind to refuel the group for the run home. Throughout the approach the strike group kept strict radio silence, so no stray transmission could betray it to Pakistani patrols. The attack itself was built around the P-15 Styx missile's profile. The Styx was a sea-skimming, radar-homing weapon with a range near 40 nautical miles, which let the boats fire from well over the horizon, unseen. Closing under cover of darkness on the night of 4–5 December, the boats crept to roughly 70 kilometres off Karachi before releasing their missiles. Pakistani sailors, unable to imagine missiles arriving from small boats at sea, at first mistook the incoming weapons for an air raid — and by then their ships were already sinking.

Then, this was a desperate, unproven gamble. Nobody in the region had fired ship-killing missiles in anger; the boats were being used far outside their design; a single Pakistani air patrol spotting the group on the run-in could have turned triumph into disaster. The men went in on nerve, darkness and radio silence, not certainty. Now, that same night is wrapped in ceremony. Every 4 December, the Indian Navy celebrates Navy Day, retelling Trident as a founding legend of its offensive spirit; wreaths are laid, the strike group is honoured, and the story is taught to every new sailor. The contrast runs deeper than ritual. In 1971 India owned a handful of small Soviet boats and one bold idea; today it operates aircraft carriers, nuclear-powered submarines and long-range missiles, and thinks of itself as a blue-water navy across the Indian Ocean. Trident is the hinge between those two navies — the moment a young, cautious, coastal force proved it could strike an enemy's harbour and come home clean. What was once a gamble is now doctrine: take the fight forward, use surprise, hit the enemy where it hurts most.

Operation Trident matters because it is the moment a modest navy chose nerve over caution and rewrote what it believed it could do. The lesson is not really about missiles; it is about imagination — taking a defensive weapon, refusing to use it defensively, and daring to strike the enemy's most guarded harbour on the first serious night of war. That mindset shaped the Indian Navy that exists today, and it is why 4 December is not just a date but a statement of identity. Trident also shows how history hardens into legend: the core facts are genuinely remarkable, so they get inflated into a city destroyed and a fleet annihilated, when the truth — two warships down, a fuel depot ablaze, not one Indian lost — needed no exaggeration. Holding the real story matters for both countries. For India it is a reminder that its proudest naval day rests on planning and daring, not myth. For Pakistan it is a hard memory of a night its coast was left exposed. Understanding Trident honestly — vivid, decisive, and free of the tallest tales — is how a victory becomes usable history instead of just a slogan.