a battle is immediately resolved, resulting in the destruction of one
army or the other. When more than one unit is in the defender's square,
the unit with the highest defensive strength defends. If it loses, then
all other armies stacked with it are destroyed as well. Successful
attackers that have a full movement point remaining after combat advance
into the defender's square.

The important factors in combat are the attack and defense
strengths of the combatants, the presence of veterans, the terrain
occupied by the defender, and any defensive improvements in the square.
After all of these factors are considered, the combat is resolved as a
simple calculation.

Shore bombardments, city attacks, nuclear attacks, and bribing
enemy armies are special types of combat.

ATTACK STRENGTH: The basic attack strength of all armies. This
full strength is brought to bear so long as the army has at
least one movement factor remaining from movement. Armies with
less movement available may still attack but are penalized.
Armies with high movement rates may makes several attacks each
turn at full strength.

DEFENSE STRENGTH: The basic defense strength of all armies.

VETERAN STATUS: Veteran armies have their attack and defense
strengths increased by 50% before any other modification. Armies
become veterans when built at cities containing the Barracks
improvement, or they may become veterans after winning a battle.

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