India, possibly irked by these developments, launched Operation Meghdoot in April 1984. An entire battalion of the Kumaon Regiment was airlifted to the glacier. Pakistani forces responded quickly, and clashes between the two followed. The Indian Army secured the strategic Sia La and Bilafond La mountain passes, and by 1985 more than of territory claimed by Pakistan was under Indian control. The Indian Army continues to control all of the Siachen Glacier and its tributary glaciers. Pakistan has made several unsuccessful attempts to regain control over Siachen. In late 1987, Pakistan mobilised about 8,000 troops and garrisoned them near Khapalu, aiming to capture Bilafond La. However, they were repulsed by Indian Army personnel guarding Bilafond. During the battle, about 23 Indian soldiers lost their lives, while more than 150 Pakistani troops perished. Further unsuccessful attempts to reclaim positions were launched by Pakistan in 1990, 1995, 1996, and 1999, most notably in Kargil in the latter year.