| Navy | The Royal Navy |
| Type | Motor minesweeper |
| Class | MMS I |
| Pennant | J 800 |
| Built by | Philip & Son Ltd. (Dartmouth, England, U.K.) |
| Ordered | 21 Aug 1942 |
| Laid down | |
| Launched | 10 Nov 1943 |
| Commissioned | 31 Jan 1944 |
| End service | |
| History | Sold in 1946 |
Commands listed for HMS MMS 300 (J 800)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | J W Lawn, RNVR | 10 Jan 1944 | 22 Nov 1944 |
| 2 | J W Lawson, RNR | 22 Nov 1944 | late 1945 |
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Notable events involving MMS 300 include:
14 Mar 1944
Convoy UGS 36.
This convoy departed Hampton Roads on 14 March 1944.
It was made up of the following transports / tankers; A.J. Cermak (American, 7176 GRT, built 1943), B.F. Shaw (American, 7176 GRT, built 1943), British Diligence (British (tanker), 8408 GRT, built 1937), Charles Crocker (American, 7176 GRT, built 1943), Dilworth (American (tanker), 7045 GRT, built 1920), Donacilla (British (tanker), 8113 GRT, built 1939), E. Kirby Smith (American, 7193 GRT, built 1943), Edward Bruce (British, 7219 GRT, built 1943), Edward Burleson (American, 7244 GRT, built 1943), Edwin L. Godkin (American, 7198 GRT, built 1943), Elisha Mitchell (American, 7177 GRT, built 1943), Erodona (British (tanker), 6207 GRT, built 1937), Frederick C. Howe (American, 7176 GRT, built 1943), Frithjof Nansen (Norwegian, 7177 GRT, built 1943), George Bancroft (American, 7176 GRT, built 1942), George H. Pendleton (American, 7176 GRT, built 1943), George M. Bibb (American, 7180 GRT, built 1943), Henry Baldwin (American, 7176 GRT, built 1942), Henry W. Longfellow (American, 7176 GRT, built 1942), Hoke Smith (American, 7199 GRT, built 1943), Howell E. Jackson (American, 7176 GRT, built 1943), Ignace Paderewski (American, 7176 GRT, built 1943), Iroquois (British (tanker), 8937 GRT, built 1907), James McHenry (American, 7191 GRT, built 1943), James Rumsey (American, 7181 GRT, built 1942), Jared Ingersoll (American, 7191 GRT, built 1942), John A. Brown (British (tanker), 10455 GRT, built 1938), John Catron (American, 7176 GRT, built 1943), John Sedgwick (American, 7176 GRT, built 1942), John Trumbull (American, 7176 GRT, built 1943), Jubal A. Early (American, 7244 GRT, built 1943), K.I. Luckenbach (American, 7822 GRT, built 1918), Kemp P. Battle (American, 7176 GRT, built 1943), Kronprinsessen (Norwegian, 7244 GRT, built 1941), Lawrence D. Tyson (American, 7176 GRT, built 1943), Lincoln Steffens (American, 7176 GRT, built 1942), Louis Hennepin (American, 7176 GRT, built 1943), Lucretia Mott (American, 7176 GRT, built 1943), Macuba (Dutch (tanker), 8249 GRT, built 1931), Marion McKinley Bovard (American, 7176 GRT, built 1942), Nathan Clifford (American, 7200 GRT, built 1943), Norfjell (Norwegian (tanker), 8129 GRT, built 1942), Norwegian (British, 6366 GRT, built 1921), Oliver Hazard Perry (American, 7176 GRT, built 1942), Patrick C. Boyle (American, 7176 GRT, built 1943), Paul H. Harwood (American (tanker), 7192 GRT, built 1918), Peter Cartwright (American, 7176 GRT, built 1942), Petter (Norwegian (tanker), 9109 GRT, built 1935), Robert R. Randall (American, 7176 GRT, built 1943), Samannan (British, 7219 GRT, built 1944), Samarkand (British, 7219 GRT, built 1943), Samburgh (British, 7219 GRT, built 1943), Samcleve (British, 7219 GRT, built 1943), Samgara (British, 7219 GRT, built 1943), Samida (British, 7219 GRT, built 1943), Samleven (British, 7210 GRT, built 1944), Samlyth (British, 7210 GRT, built 1944), Samois (British, 7219 GRT, built 1943), Samstrule (British, 7210 GRT, built 1944), Samtyne (British, 7219 GRT, built 1944), Samuel Moody (American, 7176 GRT, built 1942), Silas Weir Mitchell (American, 7176 GRT, built 1943), Solor (Norwegian (tanker), 8262 GRT, built 1938), Stephen C. Foster (American, 7196 GRT, built 1943), Sun (American (tanker), 9002 GRT, built 1928), Sun Yat-Sen (American, 7176 GRT, built 1943), Tarleton Brown (American, 7191 GRT, built 1943), Theodoric Bland (American, 7176 GRT, built 1942), Thomas Donaldson (American, 7210 GRT, built 1944), Thomas Heyward (American, 7176 GRT, built 1942), Trondheim (Norwegian (tanker), 8258 GRT, 1939), Walter Releigh (American, 7177 GRT, built 1943), William B. Wilson (American, 7176 GRT, built 1943), William D. Moseley (American, 7177 GRT, built 1943), William F. Cody (American, 7176 GRT, built 1942), William H. Dall (American, 7176 GRT, built 1943), William L. Yancey (American, 7176 GRT, built 1943) and Woodrow Wilson (American, 7177 GRT, built 1943). The LST's USS LST-27 (Lt.Cdr, L.J. Kirstine, USCG), USS LST-28 (Lt. W.N. Finley, Jr., USNR), USS LST-32 (Lt. G.P. Mulloy, USNR), USS LST-74 (Lt. S.A. Siebenthal, USN), USS LST-140 (Lt.(jg) R.W. Mickelsen, USNR), USS LST-141 (Lt. E.H. Pottle, Jr., USNR), USS LST-173 (Lt. B.J. Barber, USR), USS LST-174 (Lt. A.J. Asche, USNR), USS LST-177 (Lt.Cdr. S.H.P. Read, USNR), USS LST-178 (Lt. L.L. Bernard, USNR), USS LST-210 (Lt. R.K.W. McCoy, USNR), USS LST-262 (Lt. V.M. Hill, USCG), USS LST-265 (Lt. G.F. Sparks, Jr., USNR), USS LST-266 (Lt. L.A. Bolon, USNR), USS LST-519 (Ens. F.L. Brimmer, USN), USS LST-525 (Lt. J.R. Stevens, USN), USS LST-526 (Lt.(jg) J.W. Keeshan, USNR), USS LST-538 (Ens. H.W. Williams, USN), naval tanker USS Escalante (Cdr. C.L. Kiewert, USNR) and stores ship USS Polaris (8222 GRT, built 1939, T/Cdr. C.R. Miller, USN) were also part of the convoy.
On departure from Hampton Roads, around 0430Q/23, the convoy was escorted by Task Force 64 which was made up of the destroyers USS Decatur (Lt. D.G. Wright, USNR, with COMTASKFOR 64, Capt. H.S. Berdine, USCG on board), USS Whipple (T/Lt.Cdr. S.E. Woodard, USN, with COMDESDIV 57, on board), USS Alden (Lt. W. Herkness, 2nd, USN), USS John D. Edwards (Lt. R.A. Norelius, USNR), USS John D. Ford (T/Lt.Cdr. J.S. Slaughter, USN), destroyer escorts USS Sellstrom (Cdr. W.L. Maloney, USCG, with COMCORTDIV 23, Cdr. F.P. Vetterick, USNR, on board), USS Ramsden (Lt.Cdr. S.T. Baketel, USCGR), USS Mills (Lt.Cdr. J.S. Muzzy, USCG), USS Rhodes (Cdr. E.A. Coffin, Jr., USCG), USS Savage (Cdr. O.C. Rohnke, USCG), USS Tomich (Lt. C.B. Brown, USNR), USS Sloat (Lt.Cdr. W.A. Cashman, USNR) and the French patrol vessel Sabre.
Around 1130Z/14, USS Sellstrom parted company to proceed the Portsmouth Navy Yard to effect repairs to her sound gear. She rejoined the following day.
Around 1600Z/14, the tanker Petter parted company to proceed to New York.
Around 1200Z/15, the transport Charles Crocker parted company to return to the USA. USS Tomich was ordered to escort her and then rejoin the convoy.
Around 1400Z/15, USS Sellstrom rejoined the convoy.
Around 1200Z/16, the destroyer escort USS Richey (Cdr. P.DuP. Mills, USCG) joined the convoy. She had been unable to depart with the convoy on the 14th.
Around 0800Z/17, USS Tomich rejoined the convoy.
During 17 March 1944, USS Decatur, USS Whipple, USS Alden, USS John D. Edwards, USS John D. Ford and Sabre fuelled from USS Escalante.
Around 0225Z/18, radar contact was obtained on two vessels which proved to be the transport Oregon (French, 7705 GRT, built 1929) and her escort, the minesweeper USS Despite (Lt.(jg) F.T. Peck, Jr., USNR), coming from Bermuda. The transport subsequently joined the convoy and the minesweeper returned to Bermuda.
On 20 March 1944, USS Sloat fuelled from USS Escalante.
On 23 March 1944, USS Whipple and USS Alden fuelled from USS Escalante.
Around 1300Z/24, Hoke Smith and Iroquois were detached from the convoy to proceed to the Azores. They were escorted by USS John D. Edwards whivh had first fuelled from USS Escalante.
On 26 March 1944, USS Decatur fuelled from USS Escalante.
Around 1330Z/27, USS John D. Edwards rejoined the convoy.
Around 1545Z/27, USS John D. Ford was detached from the convoy to proceed ahead to Gibraltar to obtain written orders and other paperwork so that the Task Force would to be able to operate in the Mediterranean. Before parting company she fuelled from USS Escalante.
At 0554Z/28, the transport A.J. Cermak and USS Richey collided but damage to both was minor.
On 28 March 1944, USS Decatur, USS Whipple and USS Alden fuelled from USS Escalante.
At 0330Z/29, USS John D. Ford collided with the British auxiliary A/S trawler HMS Kingston Agate (T/Lt. R.J. Langley, RANVR) in Gibraltar harbour. The destroyer sustained extensive damage and one of her crew was killed and five were wounded. USS Alden was then detached to take over the duties of USS John D. Ford.
Around 0800Z/29, the transport Dumfries (British, 5149 GRT, built 1935) joined the convoy coming from Casablanca. She had been escorted to the rendezvous by the patrol vessel / sloop Amiral Mouchez, corvette Commandant Detroyat and the patrol vessels USS PC-480 (Lt.(jg) J.K. Miller, USNR) and USS PC-482 (Lt. D.W. Hunter, USNR) which then set course to return to Casablanca taking the transports Edward Burleson, Edwin L. Godkin, Howell E. Jackson, Oliver Hazard Perry, Oregon and USS Escalante with them. They arrived at Casablanca on 30 March 1944.
Around 2320Z/29, USS Alden rejoined from Gibraltar.
Around 2330Z/29, USS John D. Edwards parted company with the convoy to proceed to Gibraltar to refuel and then rejoin the convoy.
Around 0940Z/30, the Gibraltar section of the convoy joined. This was made up of the transports Angelo (British, 2199 GRT, built 1940), Don (British, 1037 GRT, built 1924) and Morialta (British, 1379 GRT, built 1940). At the same time USS Polaris parted company to proceed ahead of the main convoy to Oran. To escort her the destroyers USS Hilary P. Jones (T/Cdr. F.M. Stiesberg, USN) and USS Charles F. Hughes (T/Lt.Cdr. J.C.G. Wilson, USN) had arrived on the scene.
Around 1000Z/30, USS Decatur briefly stopped in Gibraltar Bay to embark a British liaison officer.
Around 1100Z/30, British (controlled) escorts joined the convoy, these were the AA cruiser HMS Colombo (Capt. H.W. Williams, RN), frigate HrMs Johan Maurits van Nassau (Cdr. A. de Booy, RNethN), sloops HMS Amethyst (Lt.Cdr. S.C. Tuke, DSO, RN), HMS Black Swan (Cdr.(Retd.) R.C.V. Thomson, DSC, RN), HMS Deptford (Lt.Cdr. H.R. White, RN) and the corvettes HMS Campion (Lt. T.F. Alderman, RNR) and HrMs Friso (Lt.Cdr. Goslings, RNethN). Also the submarine HMS Sirdar (Lt. J.A. Spender, RN) and motor minesweeper MMS 300 (T/A/Skr.Lt. J.W. Lawn, RNVR) joined for passage. The rescue tug HMRT Mindful also joined. The American minesweeper USS Speed (Lt. R.C. Dryer, USNR) joined the convoy for jamming duties (against German radio guided bombs).
Around 1100Z/31, the following ships were detached to Oran; A.J. Cermak, Dilworth, Frithjof Nansen, James Rumsey, John Catron, John Sedgwik, Norfjell, Patrick C. Boyle, Peter Cartwright, Samuel Moody, Stephen C. Foster, Walter Raleigh and William L. Yancey. From the escort, USS Richey and Sabre were also detached to Oran.
At the same time the following ships joined the convoy coming from Oran; Fort Dauphin (British, 7133 GRT, built 1943), George Abernethy (American, 7176 GRT, built 1942), John C. Fremont (American, 7177 GRT, built 1942) and Titus (Dutch, 1712 GRT, built 1930).
Around 0300A/1, the convoy was attacked by about 20 German aircraft in approximate position 36°52'N, 01°43'E. They attacked with bombs and torpedoes. Two enemy aircraft were claimed to have been shot down. The Jared Ingersoll was hit by a torpedo. USS Mills picked up the crew and together with HRMT Mindful then effected the salvage of the ship. The damaged ship arrived at Algiers later the same day.
Around 1030Z/1, USS Richey rejoined from Oran after having effected repairs there.
Around 1145Z/1, the following ships were detached to Algiers; Donacilla, Fort Dauphin, Solor and Woodrow Wilson. HMS Black Swan was also detached to Algiers.
At the same time the following ships joined the convoy coming from Oran; Atle Jarl (Norwegian, 1173 GRT, built 1919), Corstar (British, 2337 GRT, built 1918), Fort Gaspereau (British, 7134 GRT, built 1943), Indiana (Panamanian, 5617 GRT, built 1917), Ocean Fame (British, 7173 GRT, built 1942) and Ulla (British, 1575 GRT, built 1930).
Around 1130Z/2, the transport Coulgorm (British, 6997 GRT, built 1942) joined the convoy coming from Philippeville.
Around 1630Z/2, the transport Don was detached to Bone while the following ships joined the convoy coming from Bone; Bruse Jarl (Norwegian, 1890 GRT, built 1923), Fort Frobisher (British, 7134 GRT, built 1943), Fort la Prairie (British, 7138 GRT, built 1943), Fort Sturgeon (British, 7127 GRT, built 1943), Jan Lievens (Dutch, 7178 GRT, built 1942), Lidvard (Norwegian, 4785 GRT, built 1939) and Serula (British, 2187 GRT, built 1918).
Around 0115Z/3, USS Mills rejoined the convoy from Algiers.
Around 0515Z/3, the Bizerta section of the convoy made up of the following ships parted company with the convoy; B.F. Shaw, British Diligence, George Abernethy, John A. Brown, Kemp B. Battle, Lawrence D. Tyson, Paul H. Harwood, Titus and William H. Dall. Also the complete American escort proceeded to Bizerta as did all the LST's and HMS Colombo. The tanker Luminetta (British (tanker), 6159 GRT, built 1927) joined the convoy coming from Bizerta.
On 3 April 1944, the transport Empire Grebe (British, 5736 GRT, built 1918) joined the convoy coming from Tunis.
On 4 April 1944, the Indiana, HMS Sirdar and HMMS 300 arrived at Malta while the transport Eridan (French, 9928 GRT, built 1928) joined the convoy coming from Malta.
On 4 April 1944, the following ships departed Augusta to join the convoy; Blackheath (British, 4637 GRT, built 1936), Empire Guinevere (British, 7072 GRT, built 1942), Empire Southey (British, 7041 GRT, built 1942), Empire Unicorn (British, 7067 GRT, built 1943), Fort Chesterfield (British, 7100 GRT, built 1943), Fort Fidler (British, 7127 GRT, built 1943), Fort Frontenac (British, 7148 GRT, built 1943), Fort Glenora (British, 7126 GRT, built 1943), Fort Grant (British, 7133 GRT, built 1943), Fort Lennox (British, 7149 GRT, built 1943), Fort Meductic (British, 7134 GRT, built 1943), Harlesden (British, 7273 GRT, built 1943), Samshire (British, 7219 GRT, built 1943), Samsteel (British, 7219 GRT, built 1943) and Samcleve (British, 7219 GRT, built 1943).
On 5 April 1944, the following ships arrived at Augusta after having parted company with the convoy; Angelo, Atle Jarl, Bruse Jarl, Corstar, Coulgorm, E. Kirby Smith, Empire Grebe, Erodona, Fort Frobisher, Fort Gaspereau, Fort la Prairie, Fort Sturgeon, George Bancroft, George M. Bibb, Henry Baldwin, Henry W. Longfellow, Ignace Paderewski, James McHenry, Jan Lievens, John C. Fremont, John Trumbull, Lincoln Steffens, Lucretia Mott, Macuba, Marion McKinley Bovard, Morialta, Ocean Fame, Samannan, Samleven, Samstrule, Samtyne, Serula, Sun, Sun-Yat-Sen, Tarleton Brown, Theodoric Bland., Trondheim, Ulla, William D. Moseley and William F. Cody.
On 8 April 1944, the following ships arrived at Alexandria after having parted company with the convoy; Blackheath, Empire Guinevere, Empire Southey, Empire Unicorn, Eridan, Fort Chesterfield, Fort Fidler, Fort Frontenac, Fort Glenora, Fort Grant, Fort Lennox, Fort Meductic, Frederick C. Howe, Harlesden, Samlyth, Samshire, Samsteel and Stancleeve. Also the following escorts arrived at Alexandria; HrMs Johan Maurits van Nassau, HMS Amethyst and HMS Deptford.
The remaining ships in the convoy arrived at Port Said on 9 April 1944.