The portion of the setup area that is beyond distance 5 of any edge of the setup area is the AMBUSH ZONE. Players mark the corners of the ambush zone with objective tokens.
Players take turns deploying fleets as normal, but must deploy all ships before deploying any squadrons. The first player must depoy ships within the ambush zone on her odd-numbered deployment turns, starting with her first turn. She cannot deploy ships or squadrons overlapping obstacles in the ambush zone. After setup is complete, she removes all objective tokens from the play area.