 Nyorai mberi kweiyi ndima - Pakutanga kwaNovember, mauto eU.S. akanga asvika pedyo neCape Torokinauye vakagadzira beachhead, sechikamu chekuedza kweAllied kufambira mberi kunzvimbo huru yeJapan yakapoteredza Rabaul, kusurukirwa uye kuderedzwa kwaive chinangwa chikuru cheOperation Cartwheel. Kurwisa kweJapan kwakasvika paKoromokina Lagoon kwakakundwa mumazuva akatevera kuburitswa kweUS, uye beachhead yakazochengetedzwa. Zvichitevera izvi, simba rekuvharira rakasundirwa kumberi kuenda kuPiva Trail, nzira yakakosha yekusvika kuCape Torokina, kudzivirira nzvimbo yakatetepa yemahombekombe apo zvimwe zvekuwedzera nekusimbiswa zvakaburitswa. Mutungamiri weJapan paBougainville, Lieutenant General Harukichi Hyakutake, akarayira 23rd Infantry Regiment kuti iende kuCape Torokina kubva panzvimbo huru yeJapan yakapoteredza Buin. Kurwisana kwakasimba kwakazoitika panguva yeHondo yePiva Trail sezvo maJapan achifambira mberi kubva kuBuen akasangana neMarine blockade force. Hondo yacho yakaguma nokutorwa kwePiva nemauto eU.S., pashure pacho boka duku rokuongorora revashandi vokuvaka zvikepe, vaiperekedzwa neuto revarwi veMarine, rakatumwa kunotsvaka nzvimbo yakakodzera yenhandare yendege. Richitungamirirwa naMukuru William Painter, mukuru mukuru weCivil Engineer Corps, boka racho rakatsvaka nzvimbo yakakodzera inenge iri kunze kwedenderedzwa racho, mukati, uye vakatanga kugadzirira kuvakwa kwenzvimbo dzinoverengeka dzokumhara dzezvikwata zvebhomba uye ndege dzehondo. 