embourg first came into contact with german forces during the battle of belgium on 12 may 1940. the fort was surrounded on the 13th, occupying areas around the rear of the fort including the air intake tower. the neighboring chaudfontaine provided supporting fire against german infantry, who mounted an infantry attack at 10 p.m.. on the 14th the germans continued artillery fire against embourg while embourg fired in support of chaudfontaine. on the 15th, aerial bombardment started at 2 p.m., lasting until the night. the next day the aerial bombardment resumed while german units infiltrated the area around the fort . on the 17th the fort was attack by bombers, artillery and infantry. embourg called for artillery support from surrounding forts, which they could not provide, but did provide support for a while to chaudfontaine. shortly thereafter the 75mm gun turrets were knocked out of action. after sabotaging the fort's equipment, the garrison surrendered.