for accurate survey arose before combat engineering. Vast holdings had to be carefully delineated and mapped out, to plan the correct form of commercial extraction. By 1780, serious attention began to be given to the art of sapping and mining. Forts abound in the subcontinent, and to the forts the main defences withdrew for a protracted stand. On being invested, the siege (heavy) artillery including trench mortars or bombards went at it. The real work, not for the faint-hearted, went to the sappers who had to do the 'sapping' or mining. Sapping is the technique of accurately digging trenches, usually covered or zigzag, to cover one's approach to the point of assault. Corps of Engineers played a very important role on "OP Vijay" the Kargil war. The major Engineer Regiments which very actively took part were 108 Engineer Regiment as a part of 08 Mountain Division, 02 Engineer Regiment as a part of 03 Mountain Division, 106 Engineer Regiment as a part of 15 Corps and 112 Engineer as a part of 92 Mountain Brigade during operation than subsequently became the part of newly raised 14 Corps. The action areas and the commanding officers of these Engineer Regiments are appended below:- 1. 108 Engr. Regt. Commanded by Col. Rohit Mohan Chaudhri, and the Regt. operated in Drass sector under 08 Mtn. Div. The unit was awarded Battle Honour and theatre Honour. Was also awarded COAS Unit Citation for War. 2. 02 Engr. Regt. Commanded by Col. Krishnan, and operated initially in Drass sector than Chor Batala and Siachin sector under 03 Mtn. Div. The unit was awarded theatre honour 3. 106 Engr. Regt. Commanded by Col. I.P.S. Ahuja and operated in Drass & Kargil sector under 16 Corps HQ. The unit was awarded COAS UNit citation of war 4. 112 Engr. Regt. Commanded by Col. N.B.Saxena and operated in Daha & Ganasak sector under 92 Mtn. Bde. as brought in for operations from 33 Corps located from Sukhna. The unit was awarded COAS Unit Citation of war Military Engineer Services The Military Engineer Services (MES) are responsible for the design, construction and maintenance of all works, buildings, airfields, dock installations, etc., together with accessory services such as military roads, water and electricity supply, drainage, refrigeration, furniture, required by the Army, Navy, Air Force & Coast Guard in India. It is one of the largest construction and maintenance agencies in India