The Belgians began mobilisation on 25 August 1939 and by May 1940 mounted a field army of eighteen infantry divisions, two divisions of partly motorised Chasseurs Ardennais and two motorised cavalry divisions, totaling some 600,000 men.
Belgierne indledte mobiliseringen den 25. august 1939 og i maj 1940 havde de en hær i felten på 18 infanteridivisioner, to divisioner Chasseurs Ardennais (delvis motoriserede) og to motoriserede kavaleridivisioner, en styrke på ca. 600.000 mand.