After replacing Neville Chamberlain as the commander of the Movable Column, Nicholson left Peshawar on 14 June with his personal bodyguard of frontier horsemen, who took no pay and served the British only through a personal devotion to their commander. Nicholson's first act as commander was to disarm any native regiments in his column that he suspected may be disloyal. On 11 July, Nicholson managed to intercept a force of mutineers that had risen at Sialkot and murdered their British officers and civilians. After defeating them in battle, the mutineers retreated to an island on the Ravi River and Nicholson was forced to wait until 15 July before he could gather enough boats to launch an attack on the island. Nicholson's attack gained complete surprise and the British soon overwhelmed and routed the remaining sepoys. The column reached Delhi on 14 August, providing much needed support to the besieging British force. Nicholson found the British forces at Delhi to be in a sorry state, with many sick and wounded and demoralized from the ineffectual leadership of Colonel Archdale Wilson. However, Nicholson's already legendary status with dealing with the mutiny proved a major boost to the British troops who believed the young and aggressive Nicholson to be the antithesis to their old and weary commanders who had mismanaged the outbreak of the mutiny.