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