Advance Squad was a clone trooper squad that served in the Grand Army of the Republic during the Clone Wars. They were deployed to the planet of Nadiem in 21.6 BBY, where they assisted in the Battle of Nadiem.
- "We've overtaken a group of refugees from one of the outlying settlements. One of them is sick. His illness delayed their progress to the evac site."
- ―Advance Squad's ARC Captain speaking to Luminara Unduli over comms
Advance Squad was deployed to the planet of Nadiem, where they were sent to evacuate refugees away from the planet in preparation for an imminent attack by the Separatists. While Jedi General Luminara Unduli and Jedi Commander Barriss Offee led the evacuation in the town, Advance Squad was out in an outlying settlement, where they rescued a few stragglers. However, one of the refugees was sick, which delayed their progress to the evac site, and as such Commander Offee was sent to rescue them from the incoming Separatist threat.
Once the Separatists arrived, Advance Squad set up an ambush with Barriss Offee. Their ambush entailed them playing dead. Once the Separatists walked past them, the troopers flanked around and planted charges on their escape route. Following that, they hid on a hill in sniping positions.