 On 1 July 1940 Weiß was promoted to "Major".Following the conversion to the Messerschmitt Bf 109 at Braunschweig-Waggum, the "Gruppe" was tasked to attack various targets in Southern England during the Battle of Britain.The "Gruppe" was augmented again in early 1941 with a "Staffel" of Hs 123 ground attack aircraft.