Passage: In 1984, India launched Operation Meghdoot to capture the Siachen Glacier in the contested Kashmir region. In Op Meghdoot, IAF's Mi-8, Chetak and Cheetah helicopters airlifted hundreds of Indian troops to Siachen. Launched on 13 April 1984, this military operation was unique because of Siachen's inhospitable terrain and climate. The military action was successful, given the fact that under a previous agreement, neither Pakistan nor India had stationed any personnel in the area. With India's successful Operation Meghdoot, it gained control of the Siachen Glacier. India has established control over all of the 70 kilometres (43 mi) long Siachen Glacier and all of its tributary glaciers, as well as the three main passes of the Saltoro Ridge immediately west of the glacier—Sia La, Bilafond La, and Gyong La. Pakistan controls the glacial valleys immediately west of the Saltoro Ridge. According to TIME magazine, India gained more than 1,000 square miles (3,000 km2) of territory because of its military operations in Siachen.

Question: When was the radical military operation of Siachen?
13 April 1984,