Archie Mckellar experienced his first combat with No. 602 Squadron, credited with two victories soon after the outbreak of war in 1939 . McKellar's first victory earned him the distinction of being the first pilot to shoot down a German aircraft over the British Isles during the war. A year later, he gained fame in 1940 during the Battle of Britain as a part of, and later squadron leader of, No. 605 Squadron RAF, equipped with the Hawker Hurricane fighter.On 7 October 1940 he shot down five Messerschmitt Bf 109s, thus becoming an ace in a day; one of only 24 Allied aces to achieve the feat. At the time of his last mission he had claimed 21 aerial victories and another two shared destroyed against enemy aircraft. On 1 November 1940—one day after the official end of the Battle of Britain—he was killed in action.