Combat Phase

  When units from both sides occupy an
area combat ensues.  Dice are rolled
for each unit and if the roll is less
than or equal to their attack or 
defense number (depending on what the
unit is doing), then an enemy unit is
destroyed.  At the end of each round,
each player chooses which of their
units should be eliminated and the
attacker is given the option to 
retreat.  Combat values for the units
are printed on the left side of
the screen.
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