A soldier has told an inquest that he didn't realise they were shooting at British forces, and if he'd known he would have stopped immediately.
But Corporal Jonathan Dolton told the court that no messages about the location of Lance Corporal Michael Pritchard's watch post came through over the radio.
Michael Pritchard, 22 and from Eastbourne, was shot by a British sniper while he was on his first tour of duty in Afghanistan.
An inquest has heard from a British sniper who shot, and fatally wounded, another soldier in Afghanistan.
An inquest into the death of a military policeman from Sussex questions how and why he was killed.
An inquest into the death of a military policeman from Sussex will take place today.