He claimed his first two victories in September 1917 while flying an Airco DH.5, destroying an Albatros D.III on the 25th near Cambrai, and another on the 28th at Bugnicourt, France.
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The next day, Winnicott destroyed an Albatros D.V at 1340 hours; 20 minutes later, he teamed with MacLean, Meredith Thomas, and Frank Harold Taylor to drive a German two-seater down out of control over Rumilly to become a double ace.