The Indian Army Corps of Engineers is a combat support arm which provides combat engineering support, develops infrastructure for armed forces and other defence organisations and maintains connectivity along the borders, besides helping the civil authorities during natural disasters. College of Military Engineering, Pune (CME) is the premier technical and tactical training institution of the Indian Army Corps of Engineers. The Corps consists of three groups of combat engineers, namely the Madras Sappers, the Bengal Sappers and the Bombay Sappers. It has a long history dating back to the mid-18th century. The earliest existing subunit of the Corps (18 Field Company) dates back to 1777 while the Corps officially recognises its birth as 1780 when the senior-most group of the Corps, the Madras Sappers were raised. A group is roughly analogous to a brigade of the Indian infantry, each group consisting of a number of engineer regiments. The engineer regiment is the basic combat engineer unit, analogous to an infantry battalion. Besides the combat engineers, the Corps mans and operates major engineering organisations such as the Military Engineer Services, the Border Roads Organisation (BRO), the Married Accommodation Project and the Survey of India. History The Corps of Engineers is one of the oldest arms of the Indian Army. The origin of the Corps dates back to 1780 when the two regular pioneer companies were raised in the Madras Presidency Army. Subsequently, the Group of Madras, Bengal and Bombay Sappers were formed in their respective presidencies. These Groups came together when the British Indian Army was formed after 1857 and were later merged on 18 November 1932 to form the Corps of Indian Engineers. Engineer Groups initially consisted of field companies (a sub-unit organisation that exists to this day). Till 1911, the Sappers also had the duty of passing battlefield messages. Between 1911 and 1920, they handed this task to a batch of their own kinsmen who then formed the Corps of Signals. The Sappers also contributed the first batch of airmen when the Indian Air Force was raised in 1932. From 1942-1945 officers of the Indian Railways were recruited into this Corps to participate in Britain's Burma Campaign. Combat Engineers In war, Combat Engineers provide mobility to own forces by constructing bridges, tracks and helipads; on the other hand, the Corps denies the same to the enemy by creating obstacles such as laying mine-fields and demolition of bridges. The need