>>95851577
a Unit in 3.0 can only react once per turn,
units that are: Stunned, Routed, Locked in combat, Has already made a reaction, or the player has no more reaction points, cannot make a reaction.
Per player turn, the reactive player gets one reaction point, and gets a bonus if playing a 1501-3500 pt game.

in your standard 3000 point game, you get, base, 2 reactions a turn, and cannot select the same unit twice to react with per turn.