Escort Group B7


Escort Group B7 was a British formation of the Royal Navy which saw action during the Second World War; principally in the Battle of the Atlantic.

Formation

Escort Group B7 was one of seven such British naval groups which served with the Mid-Ocean Escort Force. It provided convoy protection in the most dangerous midsection of the North Atlantic route. The MOEF was originally to be five American, five British and four Canadian groups. B7 was formed in the spring of 1942, following the inability of the USN to form groups A-4 and A-5 due to other commitments. To replace them, two new escort groups, B6 and B7, were formed.

Service history

Led by, under the leadership of Commander William Banks, B7 comprised six s; from the disbanded American group A-5, and,,, and
These were joined later by the destroyers HMS Chesterfield and Ripley.
B7's first convoys, in the spring of 1942, were uneventful, and as the pace of the Battle of the Atlantic hotted up in the summer and autumn, the group's charges were escorted without loss. But in December, while escorting ON 153, the convoy came under attack, and three ships were sunk. During this action, on 11 December, Firedrake was torpedoed by the U-boat and sank with the loss of 168 of her crew, including her current commander, and the group's Senior Officer – Escort, Commander Eric Tilden. Initially 35 survived the torpedoing, but only 27 managed to get on board Sunflower, which was under the command of Captain John Treasure Jones.
B7's new SOE was Cdr Peter Gretton, of, a tough and capable leader, who quickly molded the group to his own image. At this point B7 comprised the destroyers Duncan,, the frigate, and the corvettes HMS Alisma, Loosestrife, Pink, Sunflower and.
After several convoys had been escorted without loss, B7 covered HX 231 in April 1943. This came under attack by the Lowenherz U-boat group, which sank six ships, but saw two submarines destroyed and five damaged. In May 1943, B7 escorted ONS 5, sometimes regarded as the turning point of the Atlantic campaign.

In a week long battle against three U-boat groups, Star, Amstel and later Fink, ONS 5 saw the loss of 13 ships, for the destruction of six U-boats, and the disabling of 7. At least four of these were credited to ships of the B7. Later that month returning with SC 130, B7 saw the destruction of between three and five U-boats for no losses. at least one of these was credited to ships of B7.
A series of uneventful convoys followed, as the U-boat Arm withdrew from the North Atlantic after 'Black May', while Gretton lobbied for a chance for B7 to operate as a Support Group. In October 1943 this was given, as the German U-boat Arm launched its autumn offensive.
B7 was involved in the battles for convoys ONS 20 and ON 206, ON 207 and ON 208, during which period nine U-boats were destroyed. The battle for ONS20/206 saw six U-boats sunk, of which was credited to Sunflower and another,, was damaged by Duncan, to be destroyed later in an air attack. ON 207 saw three U-boats destroyed; one, by ships of B7, another was shared with aircraft.
During this period B7 had steamed 6,700 miles, crossing back and forth across the Atlantic five times. The group members had refuelled at sea on six occasions, and had also re-armed with depth charges at sea.
Following this B7 returned to escort duty on the North Atlantic route, continuing without major incident until the group was disbanded in the summer of 1944 as part of the preparations for Operation Neptune, the naval contribution to the Normandy invasion.

Losses

Ships lost