Kammala jumla mai zuwa: A watan Satumbar 1939, 51st ya zama wani ɓangare na Ukrainian Front don mamayewar Soviet na Poland, amma bai ga yaƙi ba. Rukunin ya yi yaƙi a cikin Yakin hunturu a matsayin wani ɓangare na rundunar soja ta 7 daga Janairu zuwa Afrilu 1940. Sojoji biyar na rukunin an ba su lambar yabo ta Jarumi na Tarayyar Soviet saboda ayyukansu a lokacin yakin. A watan Yunin 1940, sashen ya shiga cikin
Soviet mamaye Bessarabia a matsayin wani ɓangare na 14th Rifle Corps. A ranar 22 ga Yuni 1941, sashin ya kasance wani ɓangare na 14th Rifle Corps na rundunar soja ta 9 a cikin Yankin Sojan Odessa. Rukunin ya kasance a yankin Danube Delta. Ya yi yaƙi da sojojin Jamus masu tasowa a cikin Operation Munich. Ya koma baya zuwa Prut sannan kuma Dniester kusa da Dubăsari. Daga nan sai aka tilasta wa rukunin komawa baya zuwa Kudancin Bug da Dnieper a Kakhovka da Kherson. A watan Nuwambar 1941, rukunin ya kasance a cikin Donbass. A ranar 16 ga Nuwamba, rukunin, yanzu wani ɓangare na rundunar soja ta 37, ya kai hari a cikin Pavlovka da Taganrog. A ranar 27 ga Nuwamba, rukunin ya shiga cikin yakin Rostov. Rukunin bai yi nasara ba har zuwa 29 ga Nuwamba kuma ya ci gaba zuwa Sultan-Saly. A watan Janairun 1942, an canza rukunin don yin yaƙi a cikin Barvenkovo-Lozovaya Operation kuma yana kan Donets. A ƙarshen Yuli, an janye sashen a kan Don da kuma fadin Manych. An rushe shi a ranar 16 ga watan Agusta kuma an tura ma'aikatanta zuwa wasu sassan.