| Navy | The Royal Hellenic Navy |
| Type | Minesweeper |
| Class | YMS |
| Pennant | |
| Built by | Wheeler Shipbuilding Corp. (Whitestone, Long Island, New York, U.S.A.) |
| Ordered | |
| Laid down | 8 Aug 1942 |
| Launched | 24 Apr 1943 |
| Commissioned | 15 Dec 1943 |
| Lost | 15 Oct 1944 |
| History | Former Royal Navy lend-lease mineweeper BYMS-2074. |
| Former name | BYMS 2074 |
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Notable events involving Kassos include:
19 May 1944
Convoy MKS 50.
This convoy departed Port Said on 19 May 1944.
On departure from Port Said the convoy was made up of the transports / tankers; Bengkalis (Dutch, 6548 GRT, built 1918), Carelia (British (tanker), 8062 GRT, built 1938), City of Capetown (British, 8046 GRT, built 1937), City of Exeter (British, 9654 GRT, built 1914), City of Sydney (British, 6986 GRT, built 1930), Empire Harry (British (tug), 479 GRT, built 1943), Empire Sandy (British (tug), 479 GRT, built 1943), Empire Voice (British, 6828 GRT, built 1940), Frans van Mieris (Dutch, 7170 GRT, built 1942), Luminetta (British (tanker), 6159 GRT, built 1927), Peter Trimble Rowe (American, 7176 GRT, built 1943), Prometheus (British, 6095 GRT, built 1925), Sambalt (British, 7219 GRT, built 1943), Skagerak (Norwegian, 4244 GRT, built 1936), Strategist (British, 6255 GRT, built 1937) and Turkistan (British, 6935 GRT, built 1939).
On departure from Port Said the convoy was escorted by the frigates HMS Dart (Cdr. J.T. Jones, RD, RNR) and HMS Shiel (Lt. H.P. Crail, DSC, RNR).
On 20 May 1944, the following transports / tankers departed Alexandria to join the convoy; Alcinous (Dutch, 6189 GRT, built 1925), Fort Meductic (British, 7134 GRT, built 1943), Kalarand (British, 1496 GRT, built 1906), Kepong (British, 1874 GRT, built 1916), Marit Maersk (Greek (former Danish), 1894 GRT, built 1938), Sofala (British, 1031 GRT, built 1937) and Trajanus (Dutch, 1712 GRT, built 1930).
The submarines RHS Papanikolis, Galatea and the minesweepers RHS Palaros, RHS Kassos, RHS Kos and RHS Patmos also departed Alexandria and joined the convoy for passage westwards.
They were escorted by the corvettes HMS Gloxinia (Lt. D. Perry, DSC, RNR), HMS Primula (T/Lt. E.N. Wilding, RNVR) and auxiliary A/S trawler HMS Wolborough (T/Lt. G.A. Hartnell, RNR) which also joined the convoy.
on 23 May 1944, the Sofala arrived at Benghazi after having been detached from the convoy.
On 24 May 1944, the following transport / tankers departed Augusta to join the convoy; Antonia (Dutch (tanker), 3357 GRT, built 1938), Archbishop Lamy (American, 7176 GRT, built 1942), Astra (Norwegian, 2164 GRT, built 1919), Cape Howe (British, 6999 GRT, built 1943), Charles Brantley Aycock (American, 7176 GRT, built 1942), Chloris (British, 1171 GRT, built 1910), Djebel Aures (French, 2835 GRT, built 1929), Empire Gain (British (tanker), 3738 GRT, built 1943), Fort Glenlyon (British, 7132 GRT, built 1943), Fort Michipicoten (British, 7152 GRT, 1943), Fort Thompson (British, 7134 GRT, built 1942), George Davis (American, 7177 GRT, built 1942), Ittersum (Dutch, 5199 GRT, built 1938), James W. Nesmith (American, 7176 GRT, built 1942), John A. Brown (British (tanker), 10455 GRT, built 1938), Joseph H. Nicholson (American, 7176 GRT, built 1943), La Drome (French, 1055 GRT, built 1910), Lincoln Steffens (American, 7176 GRT, built 1942), Samur (British, 7219 GRT, built 1943), Sinnington Court (British, 6910 GRT, built 1928), Thistledale (British, 7241 GRT, built 1942), Thistlemuir (British, 7237 GRT, built 1942) and Ugo Fiorelli (Italian, 1600 GRT, built 1943).
On 25 May 1944, the following transports / tankers arrived at Augusta after having parted company with the convoy; Carelia, Fort Meductic, Kalarand, Kepong, Luminetta, Marit Maersk, Peter Trimble Rowe, Stagerak, Strategist and Trajanus.
On 25 May 1944, the transport Chateau Latour (French, 1912 GRT, built 1914) departed Malta to join the convoy.
On 26 May 1944, the transport Djebel Aures arrived at Tunis after having been detached from the convoy while the following transports joined the convoy coming from Tunis; Lucia C. (Italian, 6123 GRT, built 1922) and William F. Cody (American, 7176 GRT, built 1942).
On 26 May 1944, the following ships arrived at Bizerta after having parted company with the convoy; Empire Harry, Empire Sandy, Frans van Mieris, George Davis, Joseph H. Nicholson, La Drome, Lincoln Steffens and Ugo Fiorelli. The four Greek minesweepers (YMS) were also detached to Bizerta. The following ships joined the convoy coming from Bizerta; Esek Hopkins (American, 7191 GRT, built 1942), Tore Jarl (Norwegian, 1514 GRT, built 1920) and Vigsnes (Norwegian, 1599 GRT, built 1930). Also the AA cruiser HMS Colombo (Capt. C.T. Jellicoe, DSO, DSC and Bar, RN) joined the convoy.
On 27 May 1944, the following ships arrived at Bone after having been detached from the convoy; Astra, Sinnington Court and Vigsnes while the P.L.M. 17 (British (former French), 4008 GRT, built 1922) joined the convoy coming from Bone. Also joining from Bone was the rescue tug HMRT Nimble.
On 27 May 1944, the transport Empire Thackeray (British, 2865 GRT, built 1942) departed Philippeville to join the convoy while the Tore Jarl arrived at Philippeville after having been detached from the convoy.
On 28 May 1944, the following ships arrived at Algiers after having been detached from the convoy; Antonia, Archbishop Lamy, Cape Howe, Charles Brantley Aycock, Chateau Latour, Empire Gain, Esek Hopkins, Fort Michipicoten, James W. Nesmith, John A. Brown, Lucia C., Prometheus, Samur, Thistledale and Thistlemuir while the following ships joined the convoy coming from Algiers; Appledore (British, 5218 GRT, built 1929), Cap-Pinede (French, 1320 GRT, built 1938), Charles Schiaffino (French, 3664 GRT, built 1930), Empire Meteor (British, 7457 GRT, built 1940), Empire Spinney (British, 871 GRT, built 1941), Fort Hudson's Hope (British, 7129 GRT, built 1942), James Rumsey (American, 7181 GRT, built 1942) and Lornaston (British, 4934 GRT, built 1925). The destroyer HMS Tigre also joined the convoy.
On 29 May 1944, the following ships arrived at Oran after having been detached from the convoy; Charles Schiaffino, Chloris, Empire Spinney, James Rumsey, William F. Cody and HMS Colombo while the following ships joined the convoy coming from Oran; Capitaine Paul Lemerle (French, 4945 GRT, built 1925), Empire Beatrice (British, 7046 GRT, built 1943), Empire Conrad (British, 7009 GRT, built 1942), Empire Crown (British, 7070 GRT, built 1944), Fort Bell (British, 7127 GRT, built 1943) and William R. Davie (American, 7177 GRT, built 1942).
On 30 May 1944, the following ships arrived at Gibraltar; Appledore, Cap-Pinede, Empire Thackeray, Fort Glenlyon, Fort Hudson's Hope111, Fort Thompson, Ittersum, Lornaston, William R. Davie as well as HMRT Nimble and the submarine RHS Papanikolis and Galatea. Also the current escort made up of HMS Dart, HMS Shiel, HMS Gloxinia, HMS Primula, HMS Wolborough as well as the HMS Tigre arrived at Gibraltar.
The remaining ships of the convoy; Alcinous, Bengkalis, Capitaine Paul Lemerle, City of Capetown, City of Exeter, City of Sydney, Empire Beatrice, Empire Conrad, Empire Crown, Empire Meteor, Empire Voice, Fort Bell, P.L.M. 17, Sambalt, Turkistan proceeded into the Atlantic and made rendezvous with convoy SL 159 coming from Freetown on 31 May 1944. A new escort had joined them off Gibraltar, this was made up of frigates HMS Towy (Cdr. H.V. King, DSO, OBE, RN), HMS Antigua (Lt.Cdr.(Retd.) D.F. White, RNR) and the corvettes HMS Knaresborough Castle (Lt. J.R. Freeman, RNR), HMS Leeds Castle (T/A/Lt.Cdr. W.T. Hodson, DSC, RNVR) and HMS Tintagel Castle (Lt. R. Atkinson, DSC and Bar, RNR).