Tremor Shells

Use this Stratagem at the start of your Shooting
phase. Select one THUNDERFIRE CANNON
model from your army. Until the end of that
phase, when resolving an attack made by that
model, subtract 1 from the wound roll, but if a
hit is scored, the target is shaken in your
opponent's next Movement phase. If a unit that
cannot FLY and is not TITANIC is shaken,
halve its Move characteristic and the result of
any Advance and charge rolls made for it