Police surrounded us with tear gas with no warning and no disperse order

We get tear gassed when we all started chanting together. They then came from around and it’s called kettling I believe and surrounded us with tear gas with no warning they were going to release any at us, and gave no disperse order. It got some of us bad so we started to go back to our cars to recoup.
At 10pm was givin a go home order and was heading back to my car with several others since we were mostly parked by the MLK bridge. It was about a 15 min walk still when police all of a sudden start arresting people behind me while also yelling “go the fuck home.” Some started to run due to fear of arrest and to try to get to the cars quicker. We was met on the other side being blocked from continuing by SWAT forces with bean bag/rubber bullet weapons. The told us to “get on the ground” when we was already trying to get out of the area and they only said “well, you should’ve left earlier.” They put me in handcuffs, proceed to step on my right leg, dropped me on the curb on my chest, and then dropped me again making me hitting my chin next. I wasn’t read my Miranda rights while being arrested. They threw all of us in cells. Refusing to give out mask for the COVID-19, and only told we was getting charged with on Disorderly conduct. We was lied to about the charges. I was calling them names, but only when I saw them (the police) act out of character of protectors like they were supposed to be.