Police said it happened in October after an alleged shoplifter stole "a box of vapes."
Prosecutors said he carried a Confederate battle flag and was part of the mob that smashed out windows to get through the east Rotunda doors.
Students are still allowed to wear Spirit Week attire for the rest of the week.
One student sprayed pepper spray into the crowd that had gathered around the fight.
According to a letter sent home to parents by Principal Michael Kelly, the fight broke out between two students in a hallway around lunch time.
Louisville Metro Police say it received reports of this happening over the weekend.
“The violence and the trauma that we're seeing manifest in our broader community is making its way into our schools,” said Katy DeFerrari, assistant superintendent of culture and climate at JCPS.
A Highlands resident said he knew something was wrong when he gave his dog a scratch, then touched his own eyes.
What does it feel like to have your face doused in pepper spray? Judging by this video posted by LMPD, it's not fun.
The break-in at the National Guard happened more than eight months ago, and while someone may be in custody for the crime, some of the items still have not been recovered.