source: This Day (Nigeria)
actor1: Military Forces of Nigeria (2015-)
actor2: Islamic State (West Africa) and/or Boko Haram - Jamaatu Ahli is-Sunnah lid-Dawati wal-Jihad
location: Monguno
notes: 15 May. Nigerian and Cameroonian forces kill 11 Boko Haram at Gomaran village of Southern Lake Chad Basin.