On 23 February British forces in Burma had suffered a serious setback when Major-General Jackie Smyth's decision to destroy the bridge over the Sittang river to prevent the enemy crossing had resulted in most of his division being trapped on the wrong side of the river. The Viceroy Lord Linlithgow sent a signal criticising the conduct of the field commanders to Churchill who forwarded it to Wavell together with an offer to send Harold Alexander, who had commanded the rearguard at Dunkirk. Alexander took command of Allied land forces in Burma in early March with William Slim arriving shortly afterwards from commanding a division in Iraq to take command of its principal formation, Burma Corps. Nevertheless, the pressure from the Japanese Armies was unstoppable and a withdrawal to India was ordered which was completed by the end of May before the start of the monsoon season which brought Japanese progress to a halt.