Little Soldier - Bernard Ashley - Google Books

https://books.google.de/books?id=2u1rwq1kaXoC&pg=PAPT180#v=onepage

When Kaninda survives a brutal attack on his village in East Africa he joins the rebel army, where he's trained to carry weapons, and use them.But aid workers take him to London, to a new family and a comprehensive school. Clan and tribal conflicts are…