Following the German occupation of Czechoslovakia, the division created new units around cadres of its own personnel, a process called "duplicating". The division then used these new formations to create its "duplicate", the 59th (Staffordshire) Motor Division. The 55th remained in the United Kingdom, in a defensive role, after the outbreak of the Second World War. In 1940, following the Battle of France, the motor division concept was abandoned. The division regained its third infantry brigade, and became the 55th (West Lancashire) Infantry Division. It remained within the United Kingdom, training for future operations as well as training replacements for combat units, and assigned to anti-invasion duties. By 1944, the division had been drained of many of its assets. The remnant of the division was used in Operation Fortitude, a deception effort that supported the Allied invasion of France. At the end of the war, the division was demobilised and not reformed.