Range

Range determines how many tiles away a unit can attack or counter-attack. If an archer attacks a guard from 2 tiles away, it won't be counter-attacked.

Range also determines the unit's attack type
 * If a unit's range is 1, then its attack type is melee and will move to the the enemy's tile when dealing a killing blow. This is very useful to capture city
 * If a unit's range is 2 or more, then its attack type is ranged and will not move to enemy's tile when dealing a killing blow. This is very useful to stay safe in the backline
 * Sometimes a ranged unit may have an Ability that makes their attack melee and thus, they will move to the the enemy's tile when dealing a killing blow.