In May 2014, in the wake of the Chibok schoolgirls kidnapping, presidents Paul Biya of Cameroon and Idriss Déby of Chad announced they were waging war on Boko Haram, and deployed troops to the Nigerian border. Boko Haram launched several attacks into Cameroon, killing 84 civilians in a December 2014 raid, but suffering a heavy defeat in a raid in January 2015. Cameroon declared victory over Boko Haram on Cameroonian territory in September 2018.