Players may choose to sacrifice one or more Units (not including Vessels) to help pay for the cost of a Tactic Card (even if they have enough resources to pay for the Tactic Card without sacrificing).
The Natural Strength of the Unit sacrificed can go toward paying the cost of the Tactic Card.
The Strength values of Sacrificed Units are still counted toward the army's total Strength.
Lay Units on their sides to signify that they are being sacrificed.
After the Battle resolution begins but before Damage is assigned, Sacrificed Units are removed from play, considered destroyed in battle, and returned to their owner's supply.