 Four of the boats were placed in reserve at one point or another during the year because of manpower shortages, something that would happen in 1942 as well.Four others returned to France where they helped to escort a pair of commerce raiders passing through the Channel in late 1941 and were part of the escort for a pair of battleships and a heavy cruiser through the Channel back to Germany in the Channel Dash in early 1942.Two boats were the first to be assigned to the Torpedo School in mid-year and they were followed by all the others over the rest of the year and 1943.