A Chadian soldier during a battle against insurgent group Boko Haram in Gambaru, Nigeria, February 26th 2015. Gambaru lies on the border with Cameroon.

A Chadian soldier during a battle against insurgent group Boko Haram in Gambaru, Nigeria, February 26, 2015. Gambaru lies on the border with Cameroon.

Credit:

Emmanuel Braun/Reuters

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