Emmanuel Jal has many scarring memories from when he was conscripted as a boy to fight in the second Sudanese civil war. But few stand out like the time he and other child soldiers escaped their quarters as members of the rebel Sudanese People's Liberation Army they had been pressured to join.
"There were a few hundred of us, and there was no food," Jal, now 34, said. "And right there I was tempted to eat my friend. That's actually the moment I remember the cannibalism started."
He paused. "There were so many other things I don't think I'll ever be able to share."
Jal, who survived the war after being taken in by a British aid worker in...