Arnold Hague's "The Allied Convoys System" says with regard to this convoy that it formed (off Oversay) on July 17-1942 and eventually had a total of 13 ships, 8 of which had sailed from the U.S. as Convoy AS 4 and joined at sea on Aug. 5-1942. Only 10 ships sailed from South Africa on Aug. 16, bound for Suez, dispersing off Aden on Aug. 29-1942.

Only the ships sailing from England are known, and listed below.

Transcribed from a document received from Olaf Evertse, Holland
His source: National Archives and Records Administration, Washington.

Notes:
WS 21P was to rendezvous with Convoy AS 4 in 08 45S 11 20W, where British escort vessels were to relieve the U.S. escorts.

Convoy speed: 15 knots to Freetown, 11 knots from rendezvous with Convoy AS 4 to Capteown.

Arnold Hague says that 3 ships from Convoy WS 21P formed a separate convoy, WS 21PG, off Durban on Aug. 19 for the Persion Gulf, dispersing off Hormuz on Sept. 1-1942.

Related external links:
Route to the East - the WS Convoys - The late Arnold Hague's unpublished book, listing the ships in all these convoys.

WS Convoys

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