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Operation Trident and its follow-up Operation Python were naval offensive operations launched on Pakistan's port city of Karachi by the Indian Navy during the Indo-Pakistani War of 1971. Operation Trident resulted in the first use of anti-ship missiles in the region, as well as the first sinking of naval vessels during hostilities in the region since World War II. India celebrates it's Navy Day annually on 4 December to mark this operation.
Karachi housed the headquarters of the Pakistani Navy and almost the entire Pakistan Navy fleet was based at Karachi Harbour. Karachi was also the hub of Pakistan's maritime trade, meaning that a blockade would be disastrous for Pakistans economy. The defence of Karachi harbour was therefore paramount to the Pakistani High Command and it was heavily defended against any air or naval strikes. Karachi received some of the best defence Pakistan had to offer, as well as cover from strike aircraft based at two airfields in the area.
Operation Trident was planned under the leadership of Admiral Sardarilal Mathradas Nanda. It drew inspiration from the success of the 1967 attack, following the Six Day War, in which the Israeli Navy frigate, Eilat was sunk by an Egyptian Navy Komar class missile boat from a range well beyond the frigate's guns.
The Indian Navy's Vidyut class missile boats, however, had limited range. So the plan for Operation Trident called for towing the missile boats towards Karachi and including a refuelling tanker in the task force to enable the task force to return back to Indian ports. The Vidyut class vessels were each armed with four SS-N-2B Styx surface-to-surface missiles with a maximum range of 40 nmi and a firing system linked to long-range MR-331 Rangout radars.
On 4 December, the Indian Navy launched a fast naval strike on the Pakistan Naval Headquarters (PNHQ) of Karachi. The task group for the operation consisted of three Vidyut class missile boats, INS Nipat (K86), INS Nirghat (K89) and INS Veer (K82) from the 25th "Killer" Missile Boat Squadron, escorted by two anti-submarine Arnala class corvettes, INS Kiltan (P79) and INS Katchall (P81), and a fleet tanker, INS Poshak. The task group was led by the Commanding Officer of the 25th Squadron, Commander Babru Bhan Yadav, embarked on INS Nipat.
As per the operational plan, the task group reached 250 nautical miles (460 km) south of Karachi and stayed in the area during the day, outside the range of Pakistan Air Force (PAF) aircraft. The plan was to attack Karachi at night because most PAF aircraft did not possess night-time bombing capability. In the evening on December 4, INS Kiltan and the 3 missile boats approached Karachi, evading Pakistani reconnaissance aircraft and surface patrol vessels.
At 2230 hrs PST, the task group converged about 70 nautical miles (130 km) south of Karachi and detected multiple targets. Commander Yadav selected the targets 45 miles to the northwest and 42 miles to the northeast for the attack, which radar analysis indicated were Pakistani warships.
INS Nirghat then steered towards and engaged the northwesterly target and after verification, fired the first SS-N-2B Styx missile at the destroyer, PNS Khaibar, which was on patrol. Khaibar mistook the missile to be an aircraft and engaged it with its Bofors anti-aircraft guns. The missile struck Khaibar on the starboard side and exploded below the aft galley in the Electrician's mess deck at about 2245 hrs PST. The ship immediately lost propulsion, plunged into darkness and the No.1 Boiler room exploded, engulfing the ship in thick black smoke. Khaibar sent out an emergency transmission to PNHQ which read "Enemy aircraft attacked in position 020 FF 20. No 1 Boiler hit. Ship stopped." In the panic of the attack, the transmission sent incorrect coordinates of the ship's position, which resulted in delays in rescuing the survivors later. With the target still afloat, at about 2249 hrs, INS Nirghat fired a second missile, which was seen approaching and again engaged with anti-aircraft guns of Khaibar. The missile struck the No.2 Boiler room on the starboard side, sinking PNS Khaibar.
At 2300 hours, INS Nipat engaged two targets to the northeast approaching Karachi. Verifying the targets, Nipat launched 1 Styx missile each at the MV Venus Challenger carrying ammunition for Pakistan from the United States forces in Saigon, and her destroyer escort PNS Shah Jahan (DD-962). The ammunition on the Venus Challenger immediately exploded as the missile struck sinking her about 26 miles south of Karachi, while Shah Jahan was irreparably damaged.
At 2320 hours, the minesweeper PNS Muhafiz, was targeted by a Styx missile from INS Veer. The missile hit Muhafiz on the port side abaft the bridge, instantaneously disintegrating the vessel before it could send a transmission to the PNHQ.
INS Nipat then continued towards Karachi, locked on to the oil storage tanks of the port from 14 nautical miles (26 km) south of the harbor. It fired two missiles at the tanks. One of the missiles misfired, while the other hit some of the fuel tanks, which were burnt and destroyed. The task force then withdrew back towards Bombay.
Overall, the Indian Navy's missile attack was carefully planned and executed well. The attack achieved complete surprise and was a shock to Pakistan's Armed Forces Command. The attack left a deep psychological and emotional impact on Pakistan's civil society and the Pakistan Armed Forces.
A disjointed and haphazard rescue operation was launched to locate and recover survivors of PNS Khaibar, while PNHQ was not aware of the sinking of PNS Muhafiz. PNHQ learnt of the fate of Muhafiz from her survivors who were rescued when a patrol vessel steered towards her burning flotsam while searching for survivors from the Khaibar.
The Pakistan Navy, on high alert as a result of the operation, raised a number of false alarms in the ensuing days about the presence of Indian Navy vessels off Karachi. One such false alarm was raised by a Pakistan Navy Fokker Friendship reconnaisance aircraft on 6 December 1971 which reported another missile attack by an Indian Navy ship. The PNHQ ordered a Pakistan Air Force (PAF) air strike on the supposed Indian ship. At 0645 hrs, fighter jets were scrambled which strafed the vessel before it was identified as Pakistan Navy's own PNS Zulfiqar, which suffered casualties and damage as a result of this friendly fire.
Operation Trident was an enormous success with no casualties or damage to the Indian task group, which returned safely back to Indian ports. The success of this operation prompted another successful attack on Pakistani Naval forces in Karachi on 8 December 1971, known as Operation Python.
Today marks its aniversary long live indian navy
Karachi housed the headquarters of the Pakistani Navy and almost the entire Pakistan Navy fleet was based at Karachi Harbour. Karachi was also the hub of Pakistan's maritime trade, meaning that a blockade would be disastrous for Pakistans economy. The defence of Karachi harbour was therefore paramount to the Pakistani High Command and it was heavily defended against any air or naval strikes. Karachi received some of the best defence Pakistan had to offer, as well as cover from strike aircraft based at two airfields in the area.
Operation Trident was planned under the leadership of Admiral Sardarilal Mathradas Nanda. It drew inspiration from the success of the 1967 attack, following the Six Day War, in which the Israeli Navy frigate, Eilat was sunk by an Egyptian Navy Komar class missile boat from a range well beyond the frigate's guns.
The Indian Navy's Vidyut class missile boats, however, had limited range. So the plan for Operation Trident called for towing the missile boats towards Karachi and including a refuelling tanker in the task force to enable the task force to return back to Indian ports. The Vidyut class vessels were each armed with four SS-N-2B Styx surface-to-surface missiles with a maximum range of 40 nmi and a firing system linked to long-range MR-331 Rangout radars.
On 4 December, the Indian Navy launched a fast naval strike on the Pakistan Naval Headquarters (PNHQ) of Karachi. The task group for the operation consisted of three Vidyut class missile boats, INS Nipat (K86), INS Nirghat (K89) and INS Veer (K82) from the 25th "Killer" Missile Boat Squadron, escorted by two anti-submarine Arnala class corvettes, INS Kiltan (P79) and INS Katchall (P81), and a fleet tanker, INS Poshak. The task group was led by the Commanding Officer of the 25th Squadron, Commander Babru Bhan Yadav, embarked on INS Nipat.
As per the operational plan, the task group reached 250 nautical miles (460 km) south of Karachi and stayed in the area during the day, outside the range of Pakistan Air Force (PAF) aircraft. The plan was to attack Karachi at night because most PAF aircraft did not possess night-time bombing capability. In the evening on December 4, INS Kiltan and the 3 missile boats approached Karachi, evading Pakistani reconnaissance aircraft and surface patrol vessels.
At 2230 hrs PST, the task group converged about 70 nautical miles (130 km) south of Karachi and detected multiple targets. Commander Yadav selected the targets 45 miles to the northwest and 42 miles to the northeast for the attack, which radar analysis indicated were Pakistani warships.
INS Nirghat then steered towards and engaged the northwesterly target and after verification, fired the first SS-N-2B Styx missile at the destroyer, PNS Khaibar, which was on patrol. Khaibar mistook the missile to be an aircraft and engaged it with its Bofors anti-aircraft guns. The missile struck Khaibar on the starboard side and exploded below the aft galley in the Electrician's mess deck at about 2245 hrs PST. The ship immediately lost propulsion, plunged into darkness and the No.1 Boiler room exploded, engulfing the ship in thick black smoke. Khaibar sent out an emergency transmission to PNHQ which read "Enemy aircraft attacked in position 020 FF 20. No 1 Boiler hit. Ship stopped." In the panic of the attack, the transmission sent incorrect coordinates of the ship's position, which resulted in delays in rescuing the survivors later. With the target still afloat, at about 2249 hrs, INS Nirghat fired a second missile, which was seen approaching and again engaged with anti-aircraft guns of Khaibar. The missile struck the No.2 Boiler room on the starboard side, sinking PNS Khaibar.
At 2300 hours, INS Nipat engaged two targets to the northeast approaching Karachi. Verifying the targets, Nipat launched 1 Styx missile each at the MV Venus Challenger carrying ammunition for Pakistan from the United States forces in Saigon, and her destroyer escort PNS Shah Jahan (DD-962). The ammunition on the Venus Challenger immediately exploded as the missile struck sinking her about 26 miles south of Karachi, while Shah Jahan was irreparably damaged.
At 2320 hours, the minesweeper PNS Muhafiz, was targeted by a Styx missile from INS Veer. The missile hit Muhafiz on the port side abaft the bridge, instantaneously disintegrating the vessel before it could send a transmission to the PNHQ.
INS Nipat then continued towards Karachi, locked on to the oil storage tanks of the port from 14 nautical miles (26 km) south of the harbor. It fired two missiles at the tanks. One of the missiles misfired, while the other hit some of the fuel tanks, which were burnt and destroyed. The task force then withdrew back towards Bombay.
Overall, the Indian Navy's missile attack was carefully planned and executed well. The attack achieved complete surprise and was a shock to Pakistan's Armed Forces Command. The attack left a deep psychological and emotional impact on Pakistan's civil society and the Pakistan Armed Forces.
A disjointed and haphazard rescue operation was launched to locate and recover survivors of PNS Khaibar, while PNHQ was not aware of the sinking of PNS Muhafiz. PNHQ learnt of the fate of Muhafiz from her survivors who were rescued when a patrol vessel steered towards her burning flotsam while searching for survivors from the Khaibar.
The Pakistan Navy, on high alert as a result of the operation, raised a number of false alarms in the ensuing days about the presence of Indian Navy vessels off Karachi. One such false alarm was raised by a Pakistan Navy Fokker Friendship reconnaisance aircraft on 6 December 1971 which reported another missile attack by an Indian Navy ship. The PNHQ ordered a Pakistan Air Force (PAF) air strike on the supposed Indian ship. At 0645 hrs, fighter jets were scrambled which strafed the vessel before it was identified as Pakistan Navy's own PNS Zulfiqar, which suffered casualties and damage as a result of this friendly fire.
Operation Trident was an enormous success with no casualties or damage to the Indian task group, which returned safely back to Indian ports. The success of this operation prompted another successful attack on Pakistani Naval forces in Karachi on 8 December 1971, known as Operation Python.
Today marks its aniversary long live indian navy
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