All three units opened the Battle of Belgium and Battle of the Netherlands with attacks against fortresses on 10 May 1940. Eben Emael was accurately bombed and assisted the paratroopers in the Battle of Fort Eben-Emael. StG 77 also assisted in the Battle of Maastricht as the German army seized vital bridgeheads. First group, with III./StG 2, II(S)/LG 2 and front-line artillery units provided covering fire, the bridges at Vroenhoven and Veldwezelt were captured, but remained under Belgian Army fire for a day.