In 1940, "Von der Groeben" was transferred to the 4. "Räumbootflottille" and participated in the Operation Weserübung, the occupation of Denmark and Norway, as part of "Kriegsschiffgruppe" 11. On 9 April 1940, "Von der Groeben" with the rest of 4. "Räumbootflottille" occupied Thyborøn on the coast of Jutland during the German invasion of Denmark.