The Ardennes Offensive

Combat system
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Spend some time learning the combat system. 
Even though it is simple, try to pay attention 
to what adjustments and shifts are happening in 
each combat. Being able to use the system to your 
advantage will prove invaluable, especially against 
live opponents.

Keep reserves
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Keep plenty of reserves ready to exploit any holes you 
punch in enemy lines. Let the lead units do the dirty 
work, then push the fresh troops through the gap to wreak 
havoc on any remaining enemy units.

Retreat
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Be sure to surround enemy units whenever possible so that 
a "retreat" result will annihilate those units.