 After the British Expeditionary Force had been evacuated from Dunkirk in Operation Dynamo in 1940, the Prime Minister Winston Churchill called for a force to be assembled and equipped to inflict casualties on the Germans and bolster British morale.Churchill told the joint Chiefs of Staff to propose measures for an offensive against German-occupied Europe, "They must be prepared with specially trained troops of the hunter class who can develop a reign of terror down the enemy coast".A staff officer, Lieutenant-Colonel Dudley Clarke, had submitted a proposal to General Sir John Dill, the Chief of the Imperial General Staff, who approved Clarke's proposal.