In an all-night attack near Lake Chad this week, the Islamist group killed 92 Chadian soldiers in what President Idriss Déby Itno said late Tuesday was the deadliest offensive yet against his military. It wasn't the only devastating demonstration of force by Boko Haram: On Monday at least 50 Nigerian troops were killed in another assault in the northern Yobe state.
What's the bigger picture? After launching its insurgency in northeast Nigeria in 2009, the group has expanded its regional footprint into nearby Chad, Niger and Cameroon.
Read OZY's story about the Nigerian conflict that's deadlier than Boko Haram.