There was only one entrance, a gateway on the south side, protected by a traverse of earth and masonry, over which was a double-storied guard-room.

Close to the north side of the enclosure was a pavilion with a flat roof prepared for musketry, and from the whole place an incessant fire was being kept up.
Sir Colin, in order to get a better view of the position, and thus be able to decide in what direction the attack could most advantageously be made, rode up the bank and placed himself close to one of Blunt's guns.

Mansfield and Hope Grant were on either side, and Augustus Anson and I were directly behind, when I heard the Commander-in-Chief exclaim, 'I am hit.' Luckily it was only by a spent bullet, which had passed through a gunner (killing him on the spot) before it struck Sir Colin on the thigh, causing a severe contusion, but nothing more.

It was a moment of acute anxiety until it was ascertained that no great damage had been done.
By this time one of Travers's guns and a howitzer, which with considerable difficulty had been dragged up the bank, opened fire on the point selected by Sir Colin for the breach--the south-east corner of the wall surrounding the Sikandarbagh.[12] Instantly Hardy (Captain of the battery) was killed and the senior Subaltern wounded: Blunt's charger was shot, and of the few men under his command 14 Europeans and 6 Gun Lascars were killed or wounded; 20 of the troop-horses were also knocked over.[13] While the heavy guns were at work on the breach, Adrian Hope, with the 53rd, cleared off a body of the enemy who had collected on our left front, and connected the barracks with the main attack by a line of skirmishers.
In less than half an hour an opening three feet square and three feet from the ground had been made in the wall.

It would have been better had it been larger, but time was precious; Sir Colin would not wait, and ordered the assault to begin.