They fortified the walls, prepared the guns, and trained for the day the swarm came.

They were right to.

You are the swarm

Analyze the stronghold, choose where to deploy your units, and overwhelm them with numbers.

One decision, then none

Every bot lost to a stronghold defense or hazard is gone for the rest of the attempt.

The routes into a stronghold are not equivalent: one is lightly held and far from the core,  one is long and heavily defended, one is short and brutally exposed. Weight them wrong, and your swarm meets its demise. Weight them right, and your swarm devours the stronghold.