Escort Group B7

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Escort Group B7
Active World War II
Country  United Kingdom
Allegiance British Empire
Branch Royal Navy
Type Escort Group
Role Anti-submarine warfare
Size ~Nine ships
Part of Western Approaches Command
Garrison/HQ Lisahally
Engagements Convoy ON 153
Convoy ONS 5
Commander WE Banks
Cdr EH Tilden
Cdr PW Gretton

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.


Escort Group B7 was one of seven such British naval groups which served with the Mid-Ocean Escort Force (MOEF). 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[edit]

B-7 Group Leader HMS Firedrake

Led by HMS Firedrake, under the leadership of Commander William Banks, B7 comprised six Flower class corvettes; HMS Loosestrife from the disbanded American group A-5, and Alisma, Coreopsis, Jonquil, Pink and Sunflower.[1][2] 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 U-211 and sank with the loss of 168 of her crew, including her current commander, and the group's Senior Officer - Escort (SOE), 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.[3]

Corvettes of B7 Group moored in Londonderry. Alisma, Dianella, Sunflower & Kingcup. The white areas are where the official censor has painted out security sensitive material
B7 Group Leader HMS Duncan

B7's new SOE was Cdr Peter Gretton, of HMS Duncan, a tough and capable leader, who quickly molded the group to his own image.

At this point B7 comprised the destroyers Duncan, Vidette, the frigate HMS Tay, and the corvettes HMS Alisma, Loosestrife, Pink, Sunflower and Snowflake.

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 (sources vary) 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.[4] 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 U-631 was credited to Sunflower and another, U-844, was damaged by Duncan, to be destroyed later in an air attack. ON 207 saw three U-boats destroyed; one, (U-282) 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.[5]

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.


Ships lost[edit]

  • HMS Firedrake torpedoed and sunk by U-211 escorting convoy ON 153 on 16 December 1942.[6]

U-Boats destroyed[7][edit]

  • U-192 depth-charged by Pink on 5 May 1943.
  • U-638 depth-charged by Loosestrife on 5/6 May 1943.
  • U-125 rammed by HMS Oribi and finished off with gun-fire by Snowflake on 6 May 1943.
  • U-531 depth-charged by Snowflake and hit by Hedgehog (a new type of anti-submarine weapon), from Vidette on 6 May 1943.
  • U-381 depth-charged by Snowflake and hit by 'Hedgehog' from Duncan on 19 May 1943.
  • U-631 depth-charged by Sunflower on 17 October 1943.
  • U-274 attacked by aircraft, hit by 'Hedgehog' from Duncan on 26 October 1943.
  • U-282 by Duncan and Vidette on 29 October 1943.

Commanding officers - Senior Officer Escort[edit]

Senior Officer Escort
From To Name
4 May 1942 1 September 1942 Cdr William Eric Banks
1 September 1942 17 December 1942 Cdr Eric Henry Tilden
December 1942 May 1944 Cdr Peter Gretton


  1. ^ Rohwer&Hummelchen 1992 p.227
  2. ^ HMS Alisma was manned by Australians - Tramp to Queen page 76
  3. ^ Tramp to Queen p.69-79
  4. ^ Gretton p163
  5. ^ Gretton p175
  6. ^ Blair p128-9
  7. ^ Kemp pp. 113-4 pp. 119 pp. 152-4


External links[edit]