Sons of Guilliman

Use this Stratagem when an ULTRAMARINES
INFANTRY or ULTRAMARINES BIKER unit
from your army is chosen to shoot with in your
Shooting phase or fight with in the Fight phase.
If that unit has the Troops Battlefield Role,
until the end of that phase, when resolving an
attack made by that unit, you can re-roll
a hit roll. Otherwise, until the end of that
phase, when resolving an attack made by that
unit, you can re-roll a hit roll of 1