Armentières, Cobby accounting for two of the enemy aircraft and his companion for one. The Australians were then pursued by four Fokker Triplanes but managed to evade their attackers. This action earned Cobby a recommendation for a second bar to his DFC, the citation noting that he had scored 21 kills to date and had "succeeded in destroying so many machines by hard work and by using his brains, as well as by courage and brilliant flying". The two bars to his DFC were gazetted on the same day, 21 September. On 16 August, Cobby led a bombing raid against the German airfield at Haubourdin, near Lille, the largest aerial assault by Allied forces up until then, resulting in 37 enemy aircraft being destroyed. The following day he led a similar attack on Lomme airfield and was recommended for the Distinguished Service Order as a result. Gazetted on 2 November, the citation for the award declared that "The success of these two raids was largely due to the determined and skilful leadership of this officer". By the end of his active service, Cobby was in charge of Allied formations numbering up to 80 aircraft. Fellow No. 4 Squadron ace, George Jones (later Chief of the Air Staff), described him as the unit's "natural leader in the air and in all off-duty activities"; his exploits made him a national hero. No. 4 Squadron was recognised as the most successful fighter squadron in France, accounting for as many as 220 victories. In September 1918, Cobby was transferred to a training unit in England, where he found the strain of instructing pupils "much worse than flying in France". He continued applying for a return to the front until the war ended in November, and was mentioned in despatches by Field Marshal Sir Douglas Haig the same month (gazetted 27 December). Though Cobby's final tally for the war is often given as 29 aircraft and 13 observation balloons destroyed, claim-by-claim analyses of his victories credit him with 24 aircraft and five balloons, for a grand total of 29, making him the highest-scoring member of the AFC, as well as the service's only "balloon-busting" ace. His proudest boast was that as a flight commander he never lost a pilot over enemy territory. Between the wars Still instructing in England following the end of the war, Cobby was chosen to lead the AFC's Anzac Day flypast