Kammala jumla mai zuwa: Yayin da "I-7" yake a Yokosuka, yakin tsibirin Aleutian ya fara ne a ranar 3 zuwa 4 ga Yuni, 1942 tare da
Jirgin saman Japan ya kai hari kan Dutch Harbor, Alaska, wanda aka biyo baya da sauri ta hanyar mamayewar Jafananci ba tare da hamayya ba a cikin tsibirin Aleutian na Attu a ranar 5 ga Yuni da Kiska a ranar 7 ga Yuni, 1942. A ranar 10 ga Yuni, 1942, "I-1", "I-2", "I-3", "I-4", "I-5", "I-6", da "I-7" an sake sanya su zuwa Arewacin Arewa don aiki a cikin Aleutians, kuma a ranar 11 ga Yuni, 1942 "I-7" ya tashi zuwa ruwan Aleutian don fara aikinsa na uku. Ta shiga cikin "K" patrol line kuma ta yi sintiri a tsibirin Unalaska. Ta kasance a cikin Gulf of Alaska a ranar 14 ga Yuli 1942 lokacin da ta yi wa jirgin ruwa mai nauyin tan 2,722 na Sojojin Amurka, wanda ke tafiya daga Bethel, Alaska, zuwa Seattle, Washington. Daga nan sai ta kai farmaki ga "Arcata" tare da harbi, ma'aikatanta na bindigogi suna samun daidaito a cikin tekuna masu tasowa. Bayan daya daga cikin harsasai na "I-7" ya buga gadar "Arcata", fasinjojinsa da ma'aikatan jirgin sun watsar da jirgin. An kashe mutane bakwai daga cikin ma'aikatan "Arcata". Bayanan Japan sun ce "I-7" ta daina wuta lokacin da ta hango jirgi mai rai a cikin ruwa, yayin da wadanda suka tsira daga "Arcata" suka ba da rahoton cewa "I-7" ta yi amfani da bindigogi a cikin jirgi, inda ya kashe wani ma'aikaci. "Arcata" ya nutse a cikin.