On board the USS Tallapoosa at the time of the sinking of that vessel, on the night of 21 August 1884. Clearing the berth deck, Ohmsen remained there until the water was waist deep, wading about with outstretched arms, rousing the men out of their hammocks. Then, going on deck, he assisted in lowering the first cutter and then the dinghy, of which he took charge.