In May 1650, Cromwell was recalled to England to command a Parliamentary force preparing to invade Scotland, and Ireton assumed command of the New Model Army in Ireland with the title and powers of Lord Deputy to complete the conquest of the country. This he proceeded to do, becoming noted as much by the savagery of his methods as for his military skill. By the middle of 1650, Ireton and his commanders faced two problems. One was the capture of the remaining cities held by the Irish Confederate and Royalists forces. The other was an escalating guerrilla war in the countryside as Irish fighters called tories attacked his supply lines. Ireton appealed to the English Parliament to publish lenient surrender terms for Irish Catholics, to end their resistance, but this was refused.