During the Second World War the brigade continued to be part of the 1st Infantry Division, and would remain with it throughout the war, and was sent to France on 25 September 1939, shortly after the outbreak of the war, and served as part of the British Expeditionary Force (BEF) in France. The brigade was to remain in France, serving alongside the French Army on the Maginot Line on the Franco-Belgian border until May 1940 when the German Army invaded Holland, Belgium and France and, during the fighting, forced the BEF to retreat to Dunkirk where the 3rd Brigade was evacuated to England, arriving on 1 June 1940.