 209 Squadron RAF.During a squadron dogfight on 21 April 1918 in the Somme River valley, LeBoutillier, Robert Foster, and Merrill Samuel Taylor shot down an Albatros two-seater and sparked a running dogfight during which Captain Roy Brown claimed to have downed Manfred von Richthofen.LeBoutillier claimed to have witnessed Brown's tracer bullets penetrating Richthofen's cockpit.