Scottsdale Police say they were called out to the ball player's home after 6pm on Saturday night.
Maxwell, 26, made national news in September when he became the first Major League Baseball player to kneel during the national anthem as a sign of protest against racial injustice. It's unclear if he order was messed up or what allegedly set him off.
On top of the aggravated assault charge, Maxwell was also booked for disorderly conduct.
'Everybody watches sports and so everybody loves sports, so I felt this was the right thing for me to do personally, ' Maxwell said at the time. "This is really upsetting, as he was given full service; I didn't even know who Bruce Maxwell was", Matt Henry of Keegan's Public House said in an interview.