Ohio State and Michigan, one of the sport’s most heated rivalries, started the day’s chaos when a fight broke out after the Wolverines upset the No. 2 Buckeyes. A group of Michigan players attempted to plant a UM flag at midfield at Ohio Stadium. The fight got so heated that multiple law enforcement agencies had to step in and break it up.

Though flag-planting isn't a new concept, it was prolific throughout Week 14's rivalry games.  Four contests ended with one team trying to slam a flag into the ground of another team's field. Predictably,

There was certainly no love lost between certain schools over college football’s rivalry weekend. Skirmishes, fights and all-out brawls broke out at several stadiums, with some clashes triggered by teams planting their flag at centerfield in their rivals’ stadiums – a sight that is becoming increasingly common.

To say Saturday was a chippy day in college football would be something of an understatement. The end of the annual "rivarly week," in which teams are typically pitted against their most hated rival,

Flag plants, profanities, fights and other chaos ignited rivalry week throughout college football. Here is a breakdown of all the heated action.