Fifty miles north of Bone, Algeria on May 26, 1917 HMS Nemesis and HMS Camelon were escorting two hospital ships, the 7,117 ton HMHS Karapara of the British India line and the 8,271 ton Union-Castle liner Dover Castle. The four ships were en route from Malta to Gibraltar when at 7pm on May 26, 1917 a torpedo fired by Kapitänleutnant Karl Neumann of the UC-67 hit the Dover Castle.

The ship was clearly marked so it must be assumed Neumann knew he was firing on a ship potentially filled
with wounded men. This was a clear violation of international law, however the Germans had announced the
month before that they would no longer observe this rule and would torpedo hospital ships without warning
like any other ship. The response from the French was to announce they would in future transport German
POW's in their hospital ships.

Nemesis and Karapara continued on to avoid being hit while Camelon came alongside the Dover Castle and
removed all on board. The captain and a small crew remained behind in an attempt to save the ship, but
Neumann fired a second torpedo an hour later which sank the Dover Castle in a few minuets. Although there
was no loss of life when the ship sank, seven men were killed by the explosion of the torpedo.

The next ship Neumann tried to sink was another Union-Castle steamer, the Lowther Castle on June 14,
but she made port and was repaired. She made it until Aug. 10, 1942 when she was sunk under her new name
Condylis by the U-438.