The experience at Nalapani so discomforted the British that Lord Hastings so far varied his plan of operations as to forego the detachment of a part of this division to occupy Gurhwal. He accordingly instructed Colonel Mawbey to leave a few men in a strong position for the occupation of the Doon and to carry his undivided army against Amar Singh's son, Colonel Ranajor Singh Thapa, who was with about 2300 elite of the Gurkha army, at Nahan. It was further intended to reinforce the division considerably; and the command was handed over to Major-General Martindell. In the meantime Colonel Mawbey had led back the division through the Keree pass, leaving Colonel Carpenter posted at Kalsee, at the north western extremity of the Doon. This station commanded the passes of the Jumna on the main line of communication between the western and eastern portions of the Gurkha territory, and thus was well chosen for procuring intelligence.