This. Game. SUCKS! No matter what intricate plan you have, what upgades you have, what troops you send out, the computer will always use one mortar, tasking out everyone you have but one troop, then pump out a dozen soldiers to finish him off. Even if, by miracle, you manage to take their end of the battlefield, your troops will surrender to THE LONE REMAINING GERMAN SOLDIER ONE BULLET WILL KILL. This game is tedious and luck based.
HAHAHA! Take that, Spewer! I beat you 100%! Oh, the perfectionist badge is so good...
See guys! It's not impossible. Just take breaks in between chapters.