Gladiators were used also by 263 Squadron during the remaining two months of the Norwegian Campaign. Prior to the German invasion of Norway, Britain had prepared this squadron for the conflict via low temperature environmental training.[29] 263 Squadron arrived on the carrier HMS Glorious on 24 April, and first operated from an improvised landing strip built by Norwegian volunteers on the frozen lake Lesjaskogsvatnet in Oppland in central southern Norway. On 25 April, a pair of Gladiators destroyed a Heinkel He 115 aircraft; Luftwaffe bombers carried out numerous retaliatory attacks upon the runway that day, wounding several pilots on the ground.[36] By the end of the day, 10 Gladiators had been destroyed for the loss of three German aircraft.[37] After less than a week, all the squadron's aircraft were unserviceable and the personnel was evacuated back to Britain.[37]