 On 7 September 1940, No. 605 moved on rotation to Croydon Aerodrome under the command of Squadron Leader Walter Churchill. McKellar scored a further four victories in a single mission on 9 September. McKellar attacked with the sun at his back with his Squadron, save for one Section which was left to provide top cover against Bf 109s. The attack was made head-on to break up the German bomber formation which consisted of a large mass of He 111s. He destroyed three He 111s with a single, 12 – second burst. The first He 111 exploded. It damaged a second which rolled over and dived down into the ground. McKellar then moved his fire to a third. Its port wing snapped off. He then destroyed a Bf 109 in the afternoon giving him a fourth success.
