After the German invasion of Norway on 9 April, "Acasta" was transferred to the Home Fleet. On 13 April, the ship joined the escort of Convoy NP1, on passage to Norway with troops for the planned landings at Narvik, but the convoy was diverted to Harstad. During 9–15 May, she escorted the badly damaged light cruiser to the Clyde for repairs after she struck a rock. On 31 May, the ship and the destroyers , , and escorted the aircraft carriers and from the Clyde to the Norwegian coast to carry out air operations in support of the evacuation of Allied forces from Norway in Operation Alphabet. "Acasta" remained with the carriers' escort throughout early June.