At just 17 years old, Behr was one of the 3,172 soldiers sent by Belgium to help defend South Korea from invading North Korean troops. 106 Belgians never returned, including some of Behr's comrades.

The genocide had many roots, some going back to centuries-old disputes. But one of them, often overlooked, is the role of Belgium. Like Congo, its bigger neighbour, Rwanda was a Belgian colony, until ...