I need tactical help

[Marek_Tucan]

It's true Soviets COULD've manufactured enough of (trucks, rails, railroad engines, railroad cars, radios, modern aircrafts...) but it would all be at expense of something - not only number of say tanks built but also time and with time, food. While Stalingrad was pulled off with little help from Lend-Lease, I can see serious problems with later large-scale attacks like Bagration. Without Lend-Lease they'd come later and with more bloodshed on Soviet side.