|First appearance||Counter-Strike: Condition Zero|
|Last appearance||Counter-Strike: Condition Zero|
Background: The town of Sienna is under high alert following new information gathered by the intelligence services. Access in and out of the town has been blocked to prevent a terrorist attack.
Terrorists: Identify the two vulnerable points of entry and gain access by detonating explosives near them.
Counter-Terrorists: Prevent the Terrorists from destroying the gates and entering the town.
Other Notes: There are 2 entrances the Terrorists may choose to attack.