In 1760 Mr. Vansittart assumed the Governorship of Bengal, and his first act was to complete the project begun by his predecessor, Mr. Holwell, namely, the dethronement of Mir Jafar. This was effected on the 20th of October, 1760; the ex-Nawab went quietly to Calcutta, and Mir Kasim reigned in his stead. The Shahzada had now become Emperor by the death of his father, and had assumed the title of Shah Alam. He was still hanging with his army round Patna, and Mir Kasim and the English determined to bring him to book. Kamgar Khan continued to lead the Imperial army aimlessly about the country, and in January, 1761, found himself near the town of Bihar. He had 35 to 40 thousand cavalry, maintained chiefly by plunder, but his only musketeers and artillery were those commanded by Law, i.e. 125 Europeans and 200 sepoys, with 18 guns of small calibre. The British commander, Major Carnac, had 650 Europeans and 5 to 6 thousand sepoys, with 12 guns. Mir Kasim had some 20,000 cavalry, and the same number of musketeers, all good troops, for "everybody was paid in the army of Kasim Ali Khan."[114] On the 14th of January, scouts brought word of the approach of the English. The Emperor consulted Law, who advised a retreat, but he was not deficient in courage, and determined to fight. The next day was fought the battle of Suan.[115] "At the dawn of day we heard that the enemy were on the march, and that they would quickly appear. No disposition of our army had yet been made by Kamgar Khan, who, in fact, troubled himself very little about the matter. It was at first decided to re-enter the camp, so I put my men as much as possible under shelter behind a bank, along which I placed my guns in what I thought the most useful positions. About 6 or 7 o'clock the enemy were seen advancing in good order, crossing a canal[116] full of mud and water, the passage of which might have been easily contested had we been ready soon enough; but everything was neglected. For some time we thought the enemy were going to encamp by the canal, but, seeing that they were still advancing, the order was given to go and meet them. The whole army was quickly out of the camp, divided into several bodies of cavalry, at the head of which were, on their elephants, the Emperor, the Generalissimo Kamgar Khan, and other principal chiefs. Scarcely were we out of the camp when we were halted to await the enemy, everything in the greatest confusion; one could see no distinction between right, left, and centre, nothing that had the appearance of an army intending to attack or even to defend itself.