A man who police say tried to defend a group of women from catcallers landed in the hospital after he was brutally assaulted in Philadelphia's Rittenhouse Square early Saturday morning.

Police say the 39-year-old man who was visiting from Texas was walking along 18th and Walnut Streets around 2:45 a.m. when he observed several men inside a Black Nissan pull up next to a group of women.

The men inside the Nissan began taunting and catcalling the women, according to investigators, prompting the victim to get involved.

"The male victim took offense to something that the guys were saying to the girls and said 'hey, watch what you're saying,'" said Philadelphia Police Captain George Fuchs.

Police say one of the men inside the Nissan then got out of the car and punched the victim once in the head. The man was knocked unconscious after he fell and struck his head on the concrete

The suspect then ran back into the Nissan which fled west on Walnut. The victim was taken to Hahnemann Hospital where he is currently in stable condition.

"This is a tragic, tragic story," Captain Fuchs said. "Here's a guy trying to stick up for these girls and he gets victimized."

Police say the suspect's Nissan had Delaware tags. They are currently looking through surveillance video to see if they can find the license plate number. They are also speaking to a witness at Central Detectives.

If you have any information on the attack, please call Philadelphia Police.