On 4 May the Supreme Allied Commander, Eisenhower allowed the German forces in Northwest Europe, including naval forces, to surrender to Montgomery and 21 Group; for this, Montgomery insisted that German naval forces, including the U-Boat arm, be surrendered intact. This would come into effect at 8 am on 5 May. Meanwhile, on 4 May, four more boats, two in the Kiel Canal and two at Flensburg, were scuttled.