| Navy | The Royal Navy |
| Type | Motor Anti-Submarine Boat |
| Class | BPB 63 feet-type |
| Pennant | MA/SB 40 |
| Built by | British Power Boat (Hythe, England, U.K.) |
| Ordered | May 1940 |
| Laid down | |
| Launched | |
| Commissioned | 4 Jun 1940 |
| End service | |
| History | Was building for Norway, Requisitioned in May 1940 |
We don't have any commands listed for HMS MA/SB 40 (MA/SB 40)
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Notable events involving MA/SB 40 include:
10 Oct 1940
Operation Medium.
Bombardment of Cherbourg.
10 October 1940.
The battleship HMS Revenge (Capt. E.R. Archer, RN) departed Plymouth for a night bombardment of Cherbourg during the night of 10/11 October. She was being escorted by the destroyers HMS Jackal (Cdr. C.L. Firth, MVO, RN), HMS Jaguar (Lt.Cdr. J.F.W. Hine, RN), HMS Javelin (Cdr. A.F. Pugsley, RN), HMS Jupiter (Cdr. D.B. Wyburd, RN), HMS Kashmir (Cdr. H.A. King, RN), HMS Kelvin (Cdr. J.H. Allison, DSO, RN) and HMS Kipling (Cdr. A. St. Clair-Ford, RN).
A cover force was also sailed from Plymouth on the same day. This force was to provide cover to the east of the bombardment force and was made up of the light cruisers HMS Newcastle (Capt. E.A. Aylmer, DSC, RN), HMS Emerald (Capt. F.C. Flynn, RN), the British destroyers HMS Broke (Cdr. B.G. Scurfield, RN), HMS Wanderer (Cdr. J.H. Ruck-Keene, DSC, RN and the Polish destroyers Garland (Cdr. K. Namiesniowski, ORP) and Burza (Cdr. A. Doroszkowski, ORP).
The light cruiser HMS Cardiff (Capt. P.K. Enright, RN) escorted by the destroyers HMS Witch (Lt.Cdr. J.R. Barnes, RN) and HMS Volunteer (Lt.Cdr. N. Lanyon, RN) departed Portsmouth to provide cover for the operation to the west of the bombardment force.
A flotilla of MA/SB boats was sailed from Plymouth to provide anti E-boat protection. These were HMS MA/SB 40, HMS MA/SB 42, HMS MA/SB 43, HMS MA/SB 44, HMS MA/SB 45, HMS MA/SB 46 and HMS MA/SB 51.
During the bombardment, which started around 0330A/11 and laster for about 20 minutes, HMS Revenge fired 120 rounds of 15” in eighteen minutes from range between 14000 and 16000 yards. Her escorting destroyers fired 801 rounds of 4.7” during the first four minutes of the bombardment and then formed a screen on the battleship.
Large fires were seen to erupt in the target area. Shore defences opened up as for being under air attack. The ships were fired on only after the bombardment had ceased. No ships were hit though despite the enemy fire being accurate.
The western cover group returned to Portsmouth at 0800A/11.
The bombardment force and the eastern cover group arrived at Portsmouth around the same time.