 Leopold III 's brother , Charles , the Count of Flanders , was appointed Regent , pending a decision about whether the King would be able to regain his former position on the throne . In February 1945 , Achille Van Acker replaced Pierlot as Prime Minister . The resistance was disarmed , and many of its members and other Belgians who had remained in the country during the occupation were mobilised into the regular Belgian army in 57 " Fusilier Battalions " . These battalions served in several battles on the western front . 100 @,@ 000 Belgians were fighting in the Allied armies by VE Day . 
