"Silence the Alarms" was a job for Murray in The Black Chateau of Sly 2: Band of Thieves
Objective[]
Destroy three alarm horns around Dimitri's nightclub.
Walkthrough[]
As Murray, you will need to pick things up and throw them at the alarm horns. Grab nearby objects or guards and throw them at the nearby alarm horn. Beware though, once you hit the alarm horn once, it will go off, summoning guards to your location until they are destroyed.
Once the first alarm has been smashed, get rid of any remaining guards before you continue to the next one. Use your binocucom or just ping waypoints to locate the two other alarms. When you approach the second alarm, Bentley will mention to you that your combat stance can be interrupted by holding down 
to spirit while moving.
Remember that guards will be summoned once you hit each alarm horn once, and they will keep coming until that alarm horn is destroyed. Once the third alarm has been destroyed, the job is complete.
Video[]
Sly 2 Band of Thieves - The Black Chateau - Silence the Alarms