The world became aware of the Messerschmitt Bf. 109 during the Battle of Britain, and it is to this day Germany's best known aircraft. Its success lay in its maneuverability and its accurate and stable handling. Throughout World War II, new models were developed; the Bf. 109G-6 "Gustav" was among the best. The first G-6s were delivered to fighter units in 1942 and saw extensive service on the Eastern Front.