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Gurdon achieved all twenty-eight of his victories between 2 April and 13 August 1918 while flying the Bristol Fighter aircraft, seventeen of them using the front gun. On 7 May he was involved in an historic engagement known as the "Two versus Twenty". Gurdon, together with his observer 2nd Lt. John Thornton, in partnership with one other Bristol Fighter aircraft, piloted by Alfred Atkey with his observer Charles George Gass engaged twenty enemy aircraft. Gurdon and Thornton shot down three enemy aircraft; Atkey and Gass shot down five.