At the start of the first battle round, select two objectives to be your foundations. Place a circular 40mm foundation marker in each one. When you draw a line from any part of one your foundation markers to any part of the other, if any part of a model’s base (or any part of a model’s hull, for a model without a base) crosses that line, that model’s unit is said to be on your defensive line.
While an IMPERIAL KNIGHTS unit from your army is on your defensive line, that unit has the Against the Horde ability.
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