also activated when enemy units move adjacent to them.

MOVEMENT RESTRICTIONS: Ground units normally move only on land.
They may move over sea squares, but only by naval transport.
Ships may not enter squares entirely made up of land except
cities that are on the coast. Air units may move over land and
sea squares, but must land on a friendly city square or Aircraft
Carrier unit to refuel. Ground units may not move from one
square adjacent to an enemy army or city directly to another
such square. The prohibited square may be adjacent to the first
enemy army, another army, or any enemy city. Ground units may
move into such a controlled square if a friendly unit is already
there. Air units, ship units, Diplomats and Caravans ignore
these restrictions.

NAVAL TRANSPORT: Ground units may be carried over sea squares
only by Triremes, Sails, Frigates, or Transports. Units may
load onto a ship by moving onto it from an adjacent land square.
Also, units on sentry duty in a city with a ship automatically
load when the ship leaves. Units aboard ships are on sentry
duty. Units may unload when activated from sentry duty and
adjacent to land. They can be activated by the normal method of
activation or by pressing the Unload key when the transporting
ship is blinking. (U Key)


COMBAT
~~~~~~
Combat occurs when a unit from one civilization attempts to
a square occupied by a unit of another civilization. When this happens
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