Twilight's Fall – a separate game. Twilight Imperium's expansions, mods and rules topics are not part of it.

Liberate

When you gain control of a planet, ready that planet if it contains a number of your infantry equal to or greater than that planet's resource value; otherwise, place 1 infantry on that planet.
Last BastionFaction ability

When you gain control of a planet, ready that planet if it contains a number of your infantry equal to or greater than that planet's resource value; otherwise, place 1 infantry on that planet.

Source: Thunder's Edge

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tirules.com
  • If the Bastion player gains control of an uncontrolled planet, they may choose if they resolve LIBERATE before or after they explore that planet.
    • If they explore first, and the number of infantry or the resource value of the planet changes while resolving the exploration, then the new values will be used when resolving LIBERATE.
  • The number of mechs is irrelevant for determining which effect to resolve.