On 30 March 1917, Bishop was named a flight commander with a temporary promotion to captain a few days later. On 31 March, he scored his second victory. Bishop, in addition to the usual patrols with his squadron comrades, soon flew many unofficial "lone-wolf" missions deep into enemy territory, with the blessing of Major Scott. As a result, his total of enemy aircraft shot down increased rapidly. On 8 April, he scored his fifth victory and became an ace. To celebrate, Bishop's mechanic painted the aircraft's nose blue, the mark of an ace. Former 60 Squadron member Captain Albert Ball, at that time the Empire's highest scoring ace, had had a red spinner fitted.