 On this occasion, "Restigouche" was the only ship of Piers' group with working radar and direction finding equipment, both necessary to locate u-boats.In the circumstances, exacerbated by a failure to reroute the convoy away from the u-boats, it is unsurprising that the convoy, once found, would be severely mauled, losing 15 of its 42 ships.This level of losses was unsustainable and Admiral Sir Percy Noble, the then Commander-in-Chief, Western Approaches, insisted that Canadian escorts immediately be withdrawn for training or reassigned to less vulnerable routes.