Japanese air attacks on the Mariana Islands and anti-aircraft guns shot down about 37 Japanese aircraft during these raids. After the Marianas began to come under attack, the United States military stepped up its raids on the Japanese-held islands which could be used to launch raids on the B-29 bases. Particular attention was given to Iwo Jima, as it was correctly assumed that the Japanese aircraft which attacked the Marianas were flying from Japan and staging through the island en route to their targets. Following the first raid against Saipan in November, XXI Bomber Command B-29s were dispatched against Iwo Jima's airfields on November 5 and 8.
Japanese settlement in the Marshall Islands report published by a German explorer, Hambruch in 1915 mentioned that three Japanese fishermen in a junk were massacred by the Marshallese at Lae Atoll in 1910. A military administration was established when Japan annexed the Marshall Islands from Germany in 1914. The Japanese government subsequently dispatched a few administrators to the Marshall Islands. Between 1915 and 1918, a few Japanese businessmen from the South Seas Trading Company ("Nanyo Boeki") sailed to the Marshall Islands and established a few trading stations at Rongrong, Talab and Majuro village. A typhoon struck Majuro in 1918 and the businessmen relocated their trading posts