Kyle Tyrrell, 47, suffered minor injuries and says his wife, Liana, was punched in the face in Sunday’s conflict at the Cosy Corner beach at Torquay.
At least one of the invaders was taken to hospital.
On social media, Mr Tyrrell wrote of what happened and urged people to protect “our women … our country is being overrun by Muslim scum”.
“The important thing is my wife, my daughters and myself walked away,” he wrote.
“It was an added bonus to witness a few of our attackers be brought to hospital by ambulance after we arrived, sucking on the pain whistles.”
He said he heard his wife’s screams and, seeing a man attacking her, ran to her aid. After he got the man into a headlock, he said up to eight other men ran in.
The war veteran, a qualified instructor in the martial art of Krav Maga, said he ended up on the ground and was kicked in the head. The couple believe the attack was racially and culturally motivated.
“I’m a war veteran and I fought in the Middle East. The main attacker was Muslim and my take is he probably didn’t like being told what to do from a woman,” Mr Tyrrell said.
“This guy was calling Liana a white s— and a white whore and telling her: ‘Your husband needs to teach you a lesson’.”
He has received Divisional Commanders and Land Commanders commendations for exemplary service, the Commandants Prize, and a Commendation for Distinguished Service in the 2007 Queen’s Birthday Honours for leadership and courage in action.