The Governor-General of India, Richard Wellesley, planned the opening of a breach in the walls of Seringapatam. The location of the breach, as noted by Beatson, the author of an account of the Fourth Mysore War, was 'in the west curtain, a little to the right of the flank of the north-west bastion. This being the old rampart appeared weaker than the new.' The Mysorean defence succeeded in preventing the establishment of a battery on the north side of the River Cauvery on 22 April 1799. However, by 1 May, working at night, the British had completed their southern batteries and brought them up to the wall. At sunrise on 2 May, the batteries of the Nizam of Hyderabad succeeded in opening a practical breach in the outer wall. In addition, the mines that were laid under the breach were hit by artillery and blew up prematurely.