264 Squadron developed a counter against single-seat aircraft such as the Bf 109. By flying in an ever-descending Lufbery circle, Defiant crews sacrificed the advantage of height but eliminated the possibility of attack from underneath, while giving 360° of defensive fire. This tactic was used by 264 Squadron, but when the Defiants of 141 Sqn were committed to combat a few months later during the Battle of Britain, it chose to ignore their advice. On 19 July, seven out of nine 141 Squadron Defiants sent to cover a convoy off Folkestone were shot down by Bf 109s of JG 51, and the remaining two survived, one badly damaged, thanks only to the intervention of Hurricanes of 111 Sqn. The Hurricane pilots reported that the Defiants had shot down four Bf 109s. Although 264 Squadron claimed 48 kills in eight days over Dunkirk, the cost was high with 14 Defiants lost. Actual German losses were no more than 12–15 enemy aircraft; the turret's wide angle of fire meant that several Defiants could engage the same target at one time, leading to multiple claims.