Swale's first aerial victory came on 30 May 1918, destroying a Pfalz D.III fighter. On 5 June he destroyed an observation balloon, and on 17 June an Albatros D.V fighter. On 20 July he drove down out of control two Fokker D.VII fighters, and destroyed another on the 22nd. He accounted for three D.VIIs in August, and five in September, being appointed a flight commander with the acting rank of captain on the 5th. As commander of "A" Flight he shot down two more D.VIIs on 1 October, finally rounding off his score with his seventeenth and final victory on 8 October, by sending another down in flames. Swale was posted back to the Home Establishment on 21 October, just prior to the armistice.