Whakaotihia te rerenga e whai ake nei: I muri i te Operation Barbarossa, te whakaekenga a Tiamana ki te Soviet Union, i tiimata i te 22 o Pipiri 1941, i whawhai a Yermolkin ki te Rohe ki te Hauauru me tana roopu. Hei waahanga o te ope taua 26, ka tiimata te wehenga me tana roopu i te pakanga i te rohe o Drogobych. I te wa o nga Pakanga Taitapa i te 25 o Hune 1941 hei waahanga o te roopu i tukuna e te wehenga he
ka whakaeke atu ki te rohe o Brody me Dubno, kātahi ka whawhai kaha ki Proskurov me Vinnytsia. I te wa i whara ai a-Major Yermolkin i te pupuhi i te wa e whawhai ana i te rohe o Radzivilov i te 28 o Pipiri. I te marama o Akuhata i te Pakanga o Kiev i tohua ia hei rangatira mo te 300th Motor Rifle Regiment o te 7th Motorized Division, e arahi ana i a ia i roto i nga pakanga nanakia ki te tonga o Kiev hei waahanga o te 26 Army. I mau a Yermolkin i te whakapae i te marama o Hepetema engari i taea e ia te hoki ki nga raina Soviet i te Oketopa, i muri i tana whiwhinga i te 680th Rifle Regiment o te 169th Rifle Division, i uru ki nga pakanga kaha hei waahanga o te 38 Army o te Southwestern Front i te rohe o Volchansk. Mai i te Hakihea i whakahau ia i te 584th Rifle Regiment o te 199th Rifle Division o te ope taua. I te Hōngongoi o te tau 1942 ka noho a Yermolkin hei kaiawhina rangatira mo te 304th Rifle Division o te ope taua i te wa o te Donbass Defensive Operation.