Footage of the melee from Friday night shows two of the victims on the ground trying to protect themselves from getting punched and kicked by a crowd of young people. The assault appears to end when a woman steps in and tells the group to stop.
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The Marines say the fight started when they asked the group of teens to stop lighting fireworks.
The video, which went viral and is now part of a law enforcement investigation, began by showing one of the Marines walking away from the crowd until one of them is punched. That triggered the Marine to turn around and charge the attacker, sparking a violent brawl.
Deputies responded to the San Clemente Pier regarding a "large group of juveniles" involved in an attack on Marines, according to a news release from the Orange County Sheriff's Department.
Two Marines were found injured when deputies arrived. They were treated at the scene and declined to be taken to a hospital. Authorities said a third Marine was also attacked.
Five juveniles believed to be involved in the attack were arrested, according to the sheriff's department.
The four boys and one girl were booked at Orange County Juvenile Hall on suspicion of assault with a deadly weapon, according to authorities. Their names are not being released due to their age.
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An investigation is ongoing.
Correction: An earlier version of this story stated that nine juveniles were arrested.