In the confusion of battle, Wali was mistakenly airlifted to an Afghan hospital by an American helicopter.
It was to be months later - including time in an American hospital, that Wali was at last back in the care of the British, but despite prolonged medical treatment, he remained blind.
Wali, a keen boxer and runner, was devastated when he was not allowed to continue as a translator, but then came the phone call which changed his life. He and his family were invited to re-settle in England.
"I said yes, I want to come, to save my life, it was good news."
Once he settled in Colchester, Wali began pounding the treadmill to keep fit. His heart was set on running races in aid of British Blind Sports.
Help For Heroes managed to find Wali a running partner, Gareth, and his first goal was to get around the Colchester Half Marathon, then on to the London Marathon - which they both completed - Wali said he is disappointed in their time of 4hrs 36mins and is now aiming to be selected for The Invictus Games.
He wants to prove that blindness should not stop people from achieving their goals and said:
"I have never been defeated by my blindness, If I can do these races and get more famous than I am at this stage. My goal is to be an inspirational speaker."