The Battalion was evacuated along with the rest of the expeditionary force in June. While the 1st Battalion was fighting in Norway, the 2nd Battalion was deployed to the Hook of Holland to cover the evacuation of the Dutch Royal Family and Government in May 1940. The 2nd Battalion was then deployed to France and ordered to defend the port of Boulogne. The guardsmen held out against overwhelming odds for three days, buying valuable time for the Dunkirk Evacuation, before they were evacuated themselves. In November 1942, during the Second World War, Jean, Grand Duke of Luxembourg joined the British Army as a volunteer in the Irish Guards.