Following the completion of the evacuation from Dunkirk, British Forces continued to operate in France, with Operation Ariel taking part in the second half of June 1940 to evacuate the remainder of British forces from ports in the west of France. "Calcutta" took part in Operation Ariel, providing anti-aircraft cover for evacuations from Saint-Jean-de-Luz in the far South-East of France, near the border with Spain from 23 to 25 June, when the Armistice between France and Germany ended the evacuations. On the return journey, "Calcutta" was in company with the Canadian destroyers and , when on the evening of 25 June "Calcutta" collided with "Fraser" off the Gironde estuary, cutting the destroyer in two. The front of "Fraser" sank quickly, while the aft part was scuttled by "Restigouche". "Calcutta" was undamaged.