The roots of the Siachen conflict reach back to the Karachi Agreement of July 1949, which demarcated the ceasefire line between India and Pakistan but stopped at a coordinate designated NJ9842. Beyond that point -- northward into the glaciers -- the line simply read "thence north to the glaciers," a phrase so vague it invited decades of dispute. India interpreted the boundary as running roughly north along the Saltoro Ridge. Pakistan read it as extending northeast to the Karakoram Pass, which would place the entire Siachen Glacier on their side. For years the ambiguity lay dormant, a cartographic abstraction in territory too remote and hostile for either nation to occupy. Then Pakistan began issuing mountaineering permits. Through the 1970s and early 1980s, foreign climbing expeditions received authorization from Islamabad to scale peaks in the Siachen region, and Pakistani Army liaison officers accompanied the teams. Each permit was a quiet assertion of sovereignty. When a Japanese expedition received permission to climb Rimo I in 1984 -- a peak overlooking both the Siachen and the approaches to Aksai Chin -- India's suspicions hardened into alarm.

Pakistan's plan, Operation Ababeel, was conceived in 1983. The commander of Pakistan's Forces Command Northern Areas declined to deploy troops during winter, setting a target date of approximately 1 May 1984. India's intelligence services, alerted by the equipment purchase and by inputs from the Research and Analysis Wing station chief in Srinagar, Vikram Sood, began assembling a competing plan. Lieutenant General P.N. Hoon oversaw the operation. The task of seizing the Saltoro Ridge fell to Brigadier Vijay Channa, commanding 26 Sector, who was given a window between 10 and 30 April. He chose 13 April -- Vaisakhi. The reasoning was tactical as well as symbolic: the Pakistanis would be least expecting an Indian operation on a major holiday. Prime Minister Indira Gandhi gave final approval after a detailed briefing from the Army brass to Defence Minister R. Venkataraman.

The first unit, led by Major R.S. Sadhu, was tasked with establishing a position on the glacier's heights. Captain Sanjay Kulkarni and Second Lieutenant Anant Bhuyan secured Bilafond La, one of the key passes on the Saltoro Ridge. Captain P.V. Yadav's unit climbed for four days to secure the remaining heights. The Indian Air Force had been supporting operations in the region since 1978, when Squadron Leader Monga and Flying Officer Manmohan Bahadur carried out the first air landing on the glacier in a Chetak helicopter to evacuate casualties from an earlier mountaineering expedition. Now that experience proved critical. India's access to the glacier ran along its steep eastern side, making the approach far more dependent on aerial resupply than Pakistan's ground-accessible western routes. Yet Pakistan's late start proved fatal to their plans. By the time their forces were ready to move, Indian troops held the Saltoro Ridge's commanding heights, including Bilafond La, Sia La, and Gyong La. The Indian advance secured 2,553 square kilometers of territory. Camps became permanent posts. Operation Ababeel was effectively over before it began.

Pakistan did not accept the outcome quietly. In 1987, then-Brigadier Pervez Musharraf led an assault that briefly captured several high points before being pushed back. India's counter-attack that same year produced one of the conflict's defining moments. Naib Subedar Bana Singh of the 8th Jammu and Kashmir Light Infantry scaled 1,500 feet of sheer ice cliff in daylight to capture a Pakistani post called the Quaid, perched at 21,153 feet above sea level. It was renamed Bana Post in his honor and remains the highest battlefield post in the world. Bana Singh received the Param Vir Chakra, India's highest gallantry award. Through 1988, Pakistani forces made repeated attempts to retake it. During one assault on 9 May 1988, they fixed four ropes and a ladder system on the ice wall below the post. The attack failed, but the ropes stayed. On 26 May, Captain Pratap Singh of the 75th Medium Regiment was killed by a grenade while removing the ladder -- one of many soldiers on both sides killed not by the enemy but by the sheer difficulty of existing at that altitude.

No reliable casualty figures exist for the Siachen conflict's early years, and the reason tells its own story: most deaths on both sides came not from combat but from the environment itself. Avalanches, crevasse falls, frostbite, pulmonary edema, and altitude sickness have killed far more soldiers than bullets. Up to ten infantry battalions from each army remain deployed at altitudes reaching 6,400 meters -- positions where the Indian Army has placed tanks and heavy ordnance above 5,000 meters, a feat no other military has replicated. The logistical cost is staggering. Every meal, every round of ammunition, every piece of equipment must be airlifted or carried to posts where temperatures drop below minus 60 degrees Celsius and winds can reach hurricane force. The Siachen Glacier is the battlefield with the highest elevation in the world, and it exacts its price from both sides with an indifference that no ceasefire agreement can address. The mountains do not care which flag flies from Bana Post.