The first commanding officer was Lieutenant Colonel (later Brigadier) NR Subramaniam and the unit was equipped with 3.7 inch howitzers.

[4][nb 1] 138 (Dehradun) Mountain Battery (Pack) of the regiment took part in operations in the Tithwal sector in Kupwara district of Jammu and Kashmir.

It fought intensely in the heroic battles of Sanjoi, Mirpur, Point 9013 (Kumaon Hill), Bugina Bulge and Jura Bridge.

The battery used direct fire from temporary positions to destroy bunkers at Upper and Lower Sanjoi.

The capture of Point 9013 gave Indian troops complete domination of the Mirpur area up to Jura Bridge on the River Kishanganga.

[7] In addition to the honour title, it was awarded one Sena Medal (Captain Prakash Gadre),[8] two Mentioned in dispatches and six commendation cards.