The 89th had no particular station assigned to it, but kept moving from place to place until a strong detachment under Major Hector Munro joined the army under the command of Major John Carnac, in the neighbourhood of Patna. Major Munro then assumed the command, and being well supported by his men, quelled a formidable mutiny among the troops. After 20 Sepoys had been executed by Major Munro by blowing them off guns, and with discipline restored, he attacked the enemy at Buxar, on 23 October 1764 in what became the Battle of Buxar. Though the force opposed to him was five times as numerous as his own, he overthrew and dispersed it. According to historian John William Fortescue, the Mughal troops had 2000 men killed, and left 133 pieces of cannon on the field; whilst Munro's troops had 289 killed, 499 wounded and 85 missing.