Japan participated in the First World War on the side of the Western powers against Germany. She was amply rewarded in the peace settlement by acquiring most of the German colonial possessions in the Far East, Japanese destroyers helped fight U-boats in the Mediterranean.
Japanese merchant ships traveling in the war zone also received camouflage paint to help protect them from German submarines. Ihave not been able to find many pictures of those ships. I have names of about 10 that probably wore camouflage, but the two in the following pictures are the only ones I found that were photographed