A youth football coach from Dorchester was arrested for disorderly conduct Saturday afternoon after he got into a fight during a game against a team from Chicopee, authorities said.

Daniel McKoy, 28, was acting aggressively, flailing his arms and yelling “[L]et’s take this outside, let’s see what you got,’’ when an officer working a detail at the game went onto the field to break up the fight, Chicopee police said.

At least 20 adults were on the field, and several were trying to hold McKoy back, when the officer arrived on the field at around 1 p.m., according to police.