HNoMS Otra (1939)

The Otra and the Rauma were two purpose-built minesweepers constructed at Nylands Verksted in Oslo. Both ships were completed and commissioned only a short time before the German invasion of Norway. The Otra class vessels used the Oropesa system of mine sweeping. As the threat of war in Europe became ever more clear the decision was made to improve the Royal Norwegian Navy's mine warfare capabilities. At first a number of 2. class gunboats were rebuilt into minelayers and mine sweepers, but with war looming it soon became clear that more capable vessels were required.

Prelude
Shortly before the German invasion the UK announced that the Royal Navy had laid a number of minefields along the coast of Norway to interfere with the German import of Swedish iron ore through the North Norwegian port of Narvik. The British government claimed to have mined three areas; off Stad, Hustadvika, and Landegode north of Bodø. In response to this report, the Norwegian government ordered the minesweepers Otra and Rauma to sail north from their base in Horten and sweep the minefields on 9 April 1940.

Otra spots the invasion force
Before the order to go north could be carried out, however, the German invasion of Norway took place in the early hours of 9 April. As reports of intruding warships started coming in the Otra was sent out to investigate, and at 0410hrs report that the intruders were Germans. The invasion flotilla blocked the Otra's return to Horten.

Capture
While her sister ship, HNoMS Rauma, was fighting the German naval forces in Horten Otra was cut off and isolated from the action. The next morning, 10 April, she was captured while at anchor in Filtvet.

German service as the Togo
After capture the Otra was renamed the Togo and put in service as a Vorpostenboot and minelayer for the rest of the war. First the Togo served in as part of Hafenschutzflotille Tromsø guarding that northern city's harbour. Later she was transferred to Hafenschutzflottille Oslo. In 1941 the Togo was part of 59th Vorpostenflottille as V 5908, where she served until April 1944 when she transferred to 65th Vorpostenflottille as V 6512. After the German surrender she was part of the German Mine Sweeping Administration (GM-SA).

Post-war service
On 18 January 1946 the Togo was returned to the Royal Norwegian Navy at Bogen and on 30 October 1946 was renamed the HNoMS Otra. In April 1949 she was rebuilt as a minelayer training ship. 21 August 1959 saw her decommissioning and she was laid up at Horten until put out of service and sold in April 1963.