After the surrender of Belgium on 28 May 1940, two "Brunos" were used by "Battery 655" between 8 and 10 June to fire on Brimont and Reims from Amifontaine. One gun was destroyed when a shell detonated prematurely in the barrel while firing on those targets. By the end of 1941, two "Brunos" were assigned to "Battery 721" and stationed at Le Verdon-sur-Mer defending the mouth of the Gironde Estuary under the command of "Artillery Group Gironde-South" (). The battery was able to retreat to Germany by 1 September 1944 after the invasion of Normandy began in June 1944, but nothing is known of its activities afterwards.