Kammala wannan jumla: A 1941, an sanya rukunin zuwa rundunar soja ta 15 kuma ta shiga cikin mamayar Jafananci na Burma. Rukunin na 143 ya rabu da shi don kama Dawei (Tavoy) da Myeik (Mergui), yayin da babban rundunar ta kama Mawlamyine (Moulmein) a ranar 31 ga Janairu 1942. A watan Maris na shekarar 1942, sashin ya yi yaƙi na kwanaki 14 a kusa da garin Taungoo a kan sashin na 200 na kasar Sin. Yaƙin ya ƙare lokacin da Sinawa suka shiga kuma suka rabu. A ranar 18 ga Afrilu, 1942, Rukunin na 55 ya kewaye Rukunin na 55 na kasar Sin, daga karshe ya shafe shi. A lokacin yakin Burma, an raba rundunar soji ta 144 daga rukunin kuma aka tura ta zuwa New Guinea. An yi amfani da ragowar na 55th don magance wani mummunan shiri
Harin Birtaniya a Donbaik (Sittwe (Akyab)) daga 18 Maris 1943. A ranar 3 ga Afrilu 1943 sashen ya fara ci gaba da wucewa Mayu, daga karshe ya kewaye da kuma kayar da wasu rukunin Burtaniya; fuskantar tsayayyar tsayayya daga Mayu 1943 zuwa gaba. Tsakiyar watan Nuwamba 1943 na 55th har yanzu yana cikin yankin Arakan. A ƙarshe, rukunin ya yi yaƙi da wani mummunan rauni wanda ya zama Yaƙin Admin Box a watan Fabrairun 1944. A ranar 19 ga Fabrairun 1944, kwamandan Rundunar Sojoji ta 112, a wancan lokacin daga mutane 3000 zuwa 400, ya katse sadarwa ta rediyo tare da hedkwatar sashen kuma ya janye mutanensa. Bayan bala'in yakin Imphal, an sanya sashin zuwa rundunar soja ta 28 a Burma kuma, bayan sun koma baya zuwa kogin Irrawaddy, an sanya su a karkashin rundunar soja ta 38. A ranar 15 ga Agusta, 1945, lokacin da aka yi magana game da Bayar da Japan, sashin na 55 ya kasance a Phnom Penh.