***SPOILER***
Redmow,
The same happened to me ; i was playing the german, i chose the same (excellent) stactic as you but those unrealistic russian reinforcement location spoiled my game.
My opponent was angry of this (lost all his reinforcement) and we simply stopped the game.
I wrote to the author, i suggest you do the same because it's a shame such a great scenario is unplayable just because of this reinforcement location flaw.