The town Coonersville has been compromised; the rebels there have made a base at the top of the mountain, and instead of wasting Combine Soldiers' lives, they sent headcrab canisters to the town. After the whole town had become zombies, a Combine sweeper team was sent in to take over the whole town and the base. The Combine turned the rebel base into the Quiver Mountain Research Faculty and Military Installment. Recently, the Citadel has lost contact with the Quiver Base.

The administrator feels that the remaining rebels around there might have taken control over it. The Combine sent Headcrab canisters to the town, but have somehow actually missed their target, and they have lost all track of them. The administrator doesn't want to send in any forces, because he says something big will be coming and they will need as many troops as possible to deal with this incoming threat. The Combine Advisors however, feel that they need to strike and take back the base. You are part of the team being deployed to infiltrate and take back the base. Good luck.