Emergency services rushed to the scene at the West Meadows camp near Ipswich on Sunday night after reports of the violence.
A horse injured during the melee, which saw two caravans torched and several other properties wrecked, had to be put down.
One man was also bitten by a police dog and needed hospital treatment during the incident, Sussex Police said.Poor dog.
Five men and a teenage boy were arrested following the incident, police said.
It comes after two men, aged 18 and 32, died when they were stabbed at the site near the A14 on Thursday.It's cultural, you know...