Air operations were intense on 15 June 1942

On 15 June 1942, the Desert Air Force was still able to operate from the airfields at Gambut. Gambut was just 30 to 35 miles east of Tobruk, so Boston's and fighter bombers had just a short hop to where the fighting was happening to the west. The fighters needed to provide escort to them as well as to the Vigorous convoy to Malta. The Germans had flown 193 sorties against the ship in the convoy on 14 and 15 June. That actually gave the 8th Army some relief, as the bombers that might have hit them were attacking the convoy, instead. The British had sufficient fighter strength so as to have intercepted them, anyway, if they had attacked the 8th Army formations. This is based on the account in Vol.III of the Official History.