|Olympic medal record|
|1928 Amsterdam||Team 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.
Eight years later he and his horse Baby won the silver medal as member of the Norwegian eventing team in the team eventing competition after finishing 27th in the individual eventing.
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.
- Jensen, Jørgen (1947). Krigen på Hedmark : Opland dragonregiment i 1940 (in Norwegian). Oslo: Tanum. p. 147.CS1 maint: unrecognized language (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Ottosen, Kristian, ed. (2004) . Nordmenn i fangenskap 1940–1945 (in Norwegian) (2 ed.). Oslo: Universitetsforlaget. p. 364.CS1 maint: unrecognized language (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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