In 1915, Archibald enlisted with the 7th Durham Light Infantry before transferring to the 218th Field Company, Royal Engineers during the second battle of the Sambre. At the age of 39, he was awarded the Victoria Cross for action while his unit was attempting to bridge the Sambre–Oise Canal. Archibald received his medal from King George V at Buckingham Palace in May 1919. From his citation: