LOS sometimes through house

[Bert Blitzkrieg]

But what to do with this ? There is not always LOS through buildings. On the contrary, usually there isn't Is . In the game which I played against POS (it is my Sherman which got knocked out). I drove the Sherman on purpose behind the building so that the building would block LOS and the Sherman could go on shelling infantry. The Marder would come later.
The plan didn't work this time. The same plan will work the next 10 times, I think.