"Winston Churchill As Prime Minister 1940-1945" Home Front 1940 - 1945: Churchill with the Chiefs of Staff in the garden of No 10 Downing Street, London. From left to right: Marshal of the Royal Air Force Sir Charles Portal; Field Marshal Sir Alan Brooke; Prime Minister Winston Churchill; Admiral of the Fleet Sir Andrew Cunningham. Rear row from left to right: Major General L C Hollis, Secretary to the Chiefs of Staff and General Sir Hastings Ismay, Chief of Staff to the Minister of Defence.