 Complete the following phrase:  In 1757, the war having spread to the continent, Cumberland was placed at the head of the Hanoverian Army of Observation, intended to defend Hanover of which George II was Elector from a French invasion. At the Battle of Hastenbeck, near Hamelin, on 26 July 1757, Cumberlands army was defeated by the superior forces of dEstrées. Despite seemingly having the advantage towards the end of the battle, Cumberlands forces began to retreat. Within a short time discipline had collapsed, and Cumberlands army headed northwards in total disorder. Cumberland hoped that the Royal Navy might bring him reinforcements and supplies which would allow him to regroup and counterattack, but the British mounted an 