Original sentence: Teram Kangri II (7,407 m) was climbed in 1978 by an Indian Army expedition led by Colonel Narendra Kumar in the first move by India to lay claim to the Siachen Glacier area.Teram Kangri III  (7,382 m ranked 73rd, Prominence = 500 m) was first climbed in 1979 by a Japanese expedition led by S.The expedition approached through Indian territory.The northeast side of the peak is in Chinese-controlled territory, the southwest side in the disputed Siachen area currently controlled by India.The peak lies on the boundary between China and the disputed Siachen Glacier region near the line of control between India and Pakistan.Their route crossed over Bilafond La, much like the first ascent of Teram Kangri I
Edited sentence: Teram Kangri II (7,407 m) was climbed in 1978 by an Indian Army expedition led by Colonel Narendra Kumar in the first move by India to lay claim to the Siachen Glacier area but India soon lost the control of this peak.The expedition approached through Pakistan territory.The peak lies on the boundary between China and Pakistan