When Britain received word that the Germans were preparing to invade Norway on 7/8 April, "Grenade" was part of the escort of Convoy ON25 and was recalled, along with the rest of the escort, to join the Home Fleet. The ship, and the destroyer , escorted the oil tanker "British Lady" to Flakstadøya in the Lofoten Islands where a refuelling and repair base was being set up to support British naval operations in northern Norway. For the rest of the month "Grenade" escorted the battleship and the aircraft carrier in Norwegian waters. The ship provided cover during the evacuation of British and French troops from Namsos in early May and tied up to the to rescue survivors after the latter's forward magazine had been hit by a bomb from a Junkers Ju 87 dive bomber and exploded on 3 May. Four men on "Grenade" were wounded by splinters from near misses during this time and she rescued 36 sailors, but twenty of them died of their wounds before the ship reached Scapa Flow on 5 May.