Two 14-year-old boys from Perryfields High School were injured after being attacked by Leasowes High School pupils during the fight on Monday afternoon.
The police were called to the fracas outside Big John's, Hagley Road West, and are now working with the schools to prevent a repeat of the violence amid fears a pitch battle has been planned for tomorrow (Friday).
A West Midlands Police spokesman said: "Police were called to Hagley Road West, at around 3.45pm on Monday to a report of disorder.
"On arrival officers found two 14-year-old boys had been injured; one suffered bruising and the other had a broken tooth."
He added: "They had allegedly been assaulted by other boys from another school.
"The local neighbourhood team is working closely with the school to resolve the matter by way of a community resolution."
A Perryfields High School pupil, who does not to want be named, said: "It was terrible and very upsetting. The two boys injured were attacked for no reason as it was a case of mistaken identity.
"The Leasowes gang came looking for one of our pupils with bricks, bars and a chair leg over an argument about money and when they could not find him they beat up two boys who had nothing to do with it.
"The whole school is talking about it and a big fight is being organised for this Friday between the two schools but hopefully it will be called off now because the police are involved."
The community resolution will be "victim led" and is designed to quell confrontation and reduce the chances of children ending up with a criminal record.
Neil Shaw, headteacher of Leasowes High School, said: "An altercation took place on Monday evening in Quinton involving students from Perryfields High School and Leasowes High School.
"Both schools have taken swift and strong action to address the situation and are working closely with the police to bring the matter to a speedy conclusion.”
Leasowes principal Neil Shaw and Perryfields headteacher Dai Meredith have been working together concerning the violence and both schools have stringent behaviour and anti-bullying guidelines in force.
The Perryfields High School guidelines state: "All pupils will behave with courtesy to all others at all times, both in and out of school and will always act in such a way that this conduct is credit to their family, their school, their community and themselves."
Leasowes High School pupils have been praised for their stance on anti-knife crime in the wake of the killing of pupil Christina Edkins last March.