By the afternoon of the 13th the engineers had driven a practicable way through the buildings intervening between the Begum Kotee and the Imambara. Heavy guns were brought into action close to the massive containing wall of the latter structure, and on the morning of the 14th the breach was reported practicable. The storming force consisted of Brasyer's Sikhs and the Tenth Foot, with the Ninetieth in support. After a short but sharp struggle the garrison fled in disorder, the Imambara was in possession of the stormers, and the second line of the enemy's defence was thus turned. The assailants in the ardour of their success pursued the fugitives into the buildings intervening between the Imambara and the Kaiserbagh itself. Those occupied, the engineers proposed to suspend active operations for the day and to resort to the process of sap. Sir Colin himself, who had ridden through the fire in the Huzrut Gunj and had entered the Imambara amidst the cheers of the troops, was understood to favour that course. But the men in the front were not to be restrained, and under a fierce fire they forced their way into a courtyard communicating with the Kaiserbagh, driving the enemy before them. Reinforcements were sent for and came hurrying up. After a brief consultation Napier and Franks resolved to push on. Franks sent his men through Saadat Ali's Mosque into the Kaiserbagh itself. Its courts, gardens and summer-houses were full of sepoys who from the roofs and battlements rained down a musketry-fire on the assailants. But the British troops fought their way into this chief citadel of the hostile position, and after a short interval of hard fighting the Kaiserbagh was in possession of Sir Colin's valiant soldiers. Its fall took in reverse the third and last line of the enemy's defence. By nightfall the palaces along the right side of the Goomtee, the Motee Mahal and the Chattee Munzil, were occupied; as also the nearer buildings of the Mess House and the Tara Kotee. With the capture of the Kaiserbagh and the other buildings within the third line of defence, Lucknow may be said to have fallen.