A BRISBANE man fighting against ISIS says he is prepared to sacrifice his life and that the terrorist group must be stopped.

Ashley Dyball, 23, aka Mitchell Scott, took to Facebook last night to declare that he didn’t care if he could not ever return to Australia and that he wanted to keep fighting to liberate “innocent women and children”.

Mr Dyball, from Brisbane’s north, is believed to have joined the Kurdish militia three days after travelling through Jordan to Iraq on May 5.

After sending the Facebook message, Mr Dyball sent proof of life to his followers last night in a fresh photograph via instant social media Snapchat.

With a scarf wrapped around his head, he stares straight at the camera, his eyes hidden behind his signature sunglasses.

He appears to be wearing a backpack, and the reflection in his glasses shows he is behind a barbed-wire fence.

Have to make this short and sweet limited times at the moment first don't believe the media they're a bunch of headline... Posted by Mitchell Scott on Wednesday, 10 June 2015

In last night’s lengthy Facebook post, Mr Dyball said he only had limited time to send the message.

media_camera Ashley Dyball sent this photo via the Snapchat app last night.

He pleaded with family and friends to understand it was his life and his decision to fight ISIS.

He also criticised the media, saying “sh-t you see here is nothing like you see on bias (sic) news reports”.

The Courier-Mail reported last week that Mr Dyball had a $150,000 bounty on his head, with cashed-up ISIS terrorists targeting foreign fighters aligned with the Kurdish militia.

Mr Dyball is believed to be aligned to the same group former Queensland army reservist Ashley Johnston, 28, was fighting with when he was killed by ISIS in February.

No news is good news. Miss everyone from home hope your all well #YPG #FUCKTHEISLAMICSTATE Posted by Mitchell Scott on Sunday, 24 May 2015

Last month Mr Dyball’s brother took to Facebook to plead with his sibling to please come home.

“We’re all pretty distraught about this and need (I don’t even know how long) some time to just process all this,” he posted on Facebook.

“And ... come home please.”

He wrote that he would rather see his older brother in jail than in a war zone.

“I’d rather he be here in a jail so I can actually see him than over there,” he posted on social media.

The Federal Government has warned that anyone involving themselves in the terror conflicts – including Australians fighting against ISIS – will be prosecuted.