Following Edward's return to England, the remaining leaders of the Scots resistance chose Sir Andrew Murray as Guardian. He soon negotiated a truce with Edward until April 1336, during which various French and Papal emissaries attempted to negotiate a peace between the two countries. In January, the Scots drew up a draft treaty agreeing to recognise the elderly and childless Edward Balliol as King, so long as David II would be his heir and David would leave France to live in England. However, David II rejected the peace proposal and any further truces. In May, an English army under Henry of Lancaster invaded, followed in July by another army under King Edward. Together, they ravaged much of the north-east and sacked Elgin and Aberdeen, while a third army ravaged the south-west and the Clyde valley. Prompted by this invasion, Philip VI of France announced that he intended to aid the Scots by every means in his power, and that he had a large fleet and army preparing to invade both England and Scotland. Edward soon returned to England, while the Scots, under Murray, captured and destroyed English strongholds and ravaged the countryside, making it uninhabitable for the English.