A Royal Marine has been awarded the Military Cross after saving the lives of five colleagues and killing a rogue gunman.

Marine Craig Buchanan, 26, was serving with 40 Commando in Nehr-e-Saraj when an Afghan policeman began shooting at his patrol, killing two and badly wounding another.

As the gunman advanced Mne Buchanan waited for a clear line of sight and killed him with a single shot.

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Despite the risk of further attacks he then gave lifesaving first aid to a colleague who had been shot in the chest, shoulder and leg.

Zimbabwe-born Mne Buchanan, formerly of St Martin’s Place, off Lewes Road, Brighton, said: “We were going to one of the checkpoints to do some low-level medical training with some of the Afghan policemen.

“When we arrived the atmosphere was different. I noticed one of the guys was clean-shaven and looking a bit too neat.

“I just had a feeling something was wrong. The hairs on your neck go up.

“We carried on patrolling and him and his mates starting attacking us.

“I just thought it’s either him or me and my mates. It’s one of those sink or swim situations.

“It’s quite difficult when there are rounds coming down and there’s dust all over the place, you don’t know where your colleagues are and where your attackers are.

“I went to a low wall and could see my friend on the floor and the attacker advancing on him with his weapon on automatic fire.

“I stood up and managed to get a clear line of sight and then I ceased his movements.”

Mne Buchanan joined the marines in January 2010 and was on his first tour of Afghanistan when the attack occurred.

A Military Cross is granted in recognition of “exemplary gallantry”.

Mne Buchanan added: “There’s a saying in the forces, either fight or flight and I guess I decided to fight.

“It’s a massive honour, I don’t think it’s sunk in yet.

“Obviously under different circumstances I wish things could have been different but I’m extremely humbled and really appreciate the honour.”

His citation read: “The way Buchanan conducted himself belies his lack of experience.

“His quick thinking and bravery saved lives and prevented a difficult situation from escalating. His exemplary gallantry is an inspiration to others and is worthy of national recognition.”