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In 1920 he and his horse Nökken finished eleventh in the individual eventing.
In 1920 he and his horse Nökken finished eleventh in the individual eventing.
The Norwegian eventing team did not finish the team eventing competition, because only two riders were able to finish the individual competition. Johnsen and Nökken also participated in the individual jumping event and finished 13th. In 1936 he and his horse Sorte Mand finished seventh as part of the Norwegian dressage team in the team dressage competition, after finishing 20th in the individual dressage event.
Johansen held the rank of Rittmester in the Norwegian Army, and fought with the 2nd Division in the 1940 Norwegian Campaign.
In 1943 he was arrested by the Germans and sent as a prisoner of war to Germany, being released at the end of the Second World War.