Rubuta ci gaba don wannan sakin layi - Korchagin ya ba da kansa ga rundunar sojojin Rasha ta Imperial a lokacin Yaƙin Duniya na I, wanda a lokacin ya ji rauni sau da yawa kuma an yi masa ado. Ya tashi daga soja zuwa ƙaramin jami'in kuma ya shiga Red Army a lokacin yakin basasa na Rasha. Bayan ya yi aiki tare da Sojojin Cikin Gida a ƙarshen, Korchagin ya kasance a cikin Soviet Central Asia a cikin 1920s, yana aiki a cikin umarni da matsayi daban-daban. A tsakiyar shekarun 1930 ya zama kwamandan brigade na inji kafin a kama shi a lokacin Babban Tsarkakewa. An saki Korchagin a cikin 1940 kuma an sake dawo da shi a cikin Red Army, yana ba da umarnin rukunin Tank na 17 a farkon Operation Barbarossa. Korchagin ya jagoranci rukunin a cikin yakin Smolensk kuma ya ci gaba da kasancewa a cikin umurnin bayan an sake tsara shi zuwa brigade saboda asarar nauyi. Bayan an lalata brigade dinsa a yakin Moscow, Korchagin ya zama mai kula da sassan aerosani kafin ya jagoranci Rundunar Tank na 17 da na 18 a yakin Voronezh
Ka yi haƙuri. Ya zama kwamandan Rundunar Sojoji na 2 na Mechanized, wanda daga baya ya zama Rundunar Sojoji ta Mechanized ta 7, a watan Satumbar 1942, ya jagoranci shi har zuwa karshen yakin. Ya zama Jarumin Tarayyar Soviet don jagorancin rundunar a lokacin yakin Dnieper, Korchagin ya jagoranci rundunar sojojin bayan yakin.