Operation Postmaster was a British special operation conducted on the Spanish island of Fernando Po, now known as Bioko, off West Africa in the Gulf of Guinea, during the Second World War. The mission was carried out by the Small Scale Raiding Force (SSRF) and the Special Operations Executive (SOE) in January 1942. Their objective was to board the Italian and German ships in the harbour and sail them to Lagos. The SSRF under the command of Major Gus March-Phillipps left Britain in August 1941 and sailed the Brixham trawler, Maid of Honour, to the Spanish colony.
The British authorities in the area refused to support the raid, which they considered a breach of Spanish neutrality. Permission for the operation to go ahead eventually came from the Foreign Office in London. On 14 January 1942, while the ships' officers were attending a party arranged by an SOE agent, the commandos entered the port aboard two tugs, overpowered the ships' crews and sailed off with the ships, including the Italian merchant vessel Duchessa d'Aosta. The raid boosted SOE's reputation at a critical time and demonstrated its ability to plan and conduct secret operations no matter the political consequences.
Background
In 1941 the British Admiralty started receiving reports that German submarines were using the rivers in Vichy French parts of Africa as a base for refuelling. The unit selected to investigate the reports was the Small Scale Raiding Force (SSRF) also known as No. 62 Commando. The SSRF was formed in 1941, and consisted of a small group of 55 commando-trained personnel working with the Special Operations Executive (SOE). While being under operational control of Combined Operations Headquarters, No. 62 Commando itself was under the command Major Gus March-Phillipps.
Maid of Honour, a 65-ton Brixham yacht trawler, left Poole harbour on 9 August 1941, bound for West Africa. The five man crew were under the command of March-Phillipps. The remainder of the SSRF under the command of Captain Geoffrey Appleyard had departed earlier aboard a troop transport ship. On 20 September 1941 after six weeks under sail Maid of Honour arrived at Freetown, Sierra Leone. Freetown was the agreed rendezvous for both groups, Appleyard's party having arrived at the end of August. After Maid of Honours arrival in Freetown the search for the German submarine bases started. Sailing into the many rivers and deltas in the area, they failed to locate any submarines or evidence of a submarine base. SOE maintained a presence in West Africa, where it could observe Vichy French, Spanish and Portuguese territories with the intention of identifying and hindering any activities that threatened Britain's colonial possessions. While the commandos were searching for the German submarine bases, SOE agents had become aware of three vessels in the port of Santa Isabel on the Spanish island of Fernando Po off the coast of Africa near the borders of Nigeria and the Guinea.
The three ships were the Italian 8,500-ton merchant vessel Duchessa d'Aosta, the large German tug Likomba, and a diesel-powered barge Bibundi. Duchessa d'Aosta had a working radio which was considered a threat, with the potential to provide details of Allied naval movements. Her declared cargo was 3 million pounds of wool, 316,610 pounds of hides and skins, 1.3 million pounds of tanning materials, 4 million pounds of copra, 544,660 pounds of crude asbestos fibre and over 1.1 million ingots of electrolytic copper. The first page of the ship's cargo manifest, was not presented to the port authorities and the ship's captain refused to provide them with any details, which led to speculation it was also carrying arms or ammunition. In his visits to the island, SOE agent Leonard Guise kept the ships under observation, and in August 1941 submitted a plan to seize Likomba and disable Duchessa d'Aosta. Approval for the military operation in a neutral port was given by the Admiralty on 20 November 1941.