 Should the gunner need to escape from the turret in an emergency, the only way he could do this was to traverse the turret to one side and bail out through the escape hatch — but if the aircraft's electric system was disabled, immobilizing the all-electric turret due to its power source being knocked out, there was no escape.After the strong intervention of Dowding, who realised the Defiant was designed to an unworkable concept, there were only two units equipped with this aircraft, 141 and 264 squadrons.On 19 July, after encountering Bf 109s of III./JG 51, 141 Sqn had four Defiants shot down, one written off and one damaged, with 10 crew members killed or missing.