Speed
The higher the speed of a unit, the quicker it will arrive at the target and return. The speed of a unit can be the difference in getting support in place or having the attack land at the right time. Since troops are usually sent in mixed groups, the speed of the entire group will only be as fast as the slowest unit.
For land troops, that is the
Catapult which has a speed of 2
The
Colony Ship is the slowest naval unit with a speed of 3
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