Buuxi weedhan soo socota: Waxaa loo xilsaaray Ciidanka Badda ee Japan bishii Oktoobar 1940 isagoo ahaa Madaxa Qeybta Hawlgallada, Tomioka wuxuu sii waday inuu u adeego awoodaas labada sano ee ugu horreysa Dagaalkii Baasifigga, xilligaas oo uu si guul la'aan ah uga soo horjeestay weerarkii Pearl Harbor. Waxa kale oo uu si adag uga soo horjeestay qorshaha Admiral Isoroku Yamamoto ee
Howlgalka dhexdhexaadka ah, oo u soo jeediyay in Japan ay qabsato jasiiradaha muhiimka ah ee Fiji iyo Samoa halkii ay joogi lahaayeen. Tomioka wuxuu sidoo kale ku riixay in diirada la saaro qabsashada Port Moresby ee New Guinea, ama sidii goob loogu soo duulo Australia, ama in laga saaro maraakiibta xambaara maraakiibta Mareykanka sida ugu macquulsan saldhigyadooda. Waxaa la diiday markii Yamamoto uu ku hanjabay inuu is casilo.