Hammer Blow

Use this Stratagem in your Shooting phase, when
a model is destroyed by an attack made by an
AERONAUTICA IMPERIALIS model (Flyer).
That destroyed model’s unit is pinned until the
start of your next turn. Halve the result of any
Advance and charge rolls made for pinned units.
When resolving an attack made with a ranged
weapon by a model from a pinned unit, subtract
1 from the hit roll.
Location: PA, pg 68.