Hindu Rao's house was the little Gurkhas' hospital as well as their barrack, for their sick and wounded begged to be left with their comrades instead of being taken to camp.[14] Failing in their attempts on the centre of the position, the mutineers soon after daylight on the 12th, having concealed themselves in the ravines adjoining Metcalfe House, attacked the Flagstaff Tower, the piquet of which was composed of two Horse Artillery guns and two companies of the 75th Foot, under the command of Captains Dunbar and Knox.

A heavy fog and thick mist rolling up from the low ground near the Jumna completely enveloped the Ridge and the left front of our position, hiding everything in the immediate vicinity.

The piquet was on the point of being relieved by a detachment of the 2nd Bengal Fusiliers, when a large body of the enemy, who had crept up unobserved, made a rush at the Flagstaff Tower, and as nearly as possible captured the guns.

The piquet was hardly pressed, Knox and several men were killed, and but for the timely arrival of two companies of the 60th, the rebels would have gained the day.
This engagement was scarcely over, when masses of insurgents advanced from the Sabzi Mandi upon Hindu Rao's house, and into the gardens on the right flank of the camp, threatening the Mound piquet.

Reserves were called up, these attacks, in their turn, were repulsed and the rebels were pursued for some distance.