<prompt> Pedzisa mutsara unotevera: Musi wa30 September, Gruppe yakaenda kunhandare yendege paUetersen, ichibhururuka mishoni dzekudzivirira pamusoro peGerman Bight. The chikwata rakatamisirwa kakawanda uye akanga achibhururuka mukudzivirira Reich kubva Esbjerg musi 10 May 1940, kutanga Hondo France. Pana 14 May, I. Jagd Gruppe yakatamiswa kuEssen-Mülheim nokuda kwemabasa anorwisana neFrance. Musi waMay 23, vakatamirazve, panguva ino kuFerme Montecouvez, nhandare yendege iri kumaodzanyemba kweCambrai. Mazuva maviri gare gare, I. Jagd Gruppe akapiwa basa rekupa varwi vanoperekedza vatakuri veGermany vachidzorera mauto e4 pedyo neCambrai. Pachinangwa ichi, Clausen akati Armée de lair Potez 63 ndege mbiri-engined yakadonha. Mukurwisana uku, Messerschmitt Bf 109 E yake yakakuvadzwawo, zvichiguma nokumanikidzwa kumhara pedyo neCambrai. Pana 15 June, I. Jagd Gruppe yakatamiswa kuSaint-Omer,  <response>: chibvumirano chokurwisana chakasainwa musi wa 22 June, kuchigumisa Hondo yeFrance musi wa 25 June. Boka racho rakapiwa mazuva matatu okuzorora, vamwe vatyairi vendege vakatumirwa kumba kuzororo. Musi wa 30 Chikumi, I. Jagd Gruppe yakamhanya kunopinda ndege yeRoyal Air Force Bristol Blenheim vabhomba zvichikonzera kurwa kumaodzanyemba kwakadziva kumadokero kweSaint-Omer. In kuonana ichi, Clausen akati Blenheim kubva No. 110 Squadron akapfura pasi iyo haina kusimbiswa asi akanga pachake akapfura pasi ake Bf 109 E. Clausen akanga paakavapa Iron Cross 1st Kirasi musi 4 July 1940 uye akasimudzirwa kuti Oberleutnant wechipiri lieutenant musi 1 February 1941. Zuva iroro, Clausen akagadzwawo Staffelkapitän mutungamiri wechikwata we1. Jagd Staffel weLG 2, chikwata ichi chakava 1. Staffel we Jagdgeschwader 77 JG 7777th Fighter Wing musi wa 6 Ndira 1942. 