source: Twitter
actor1: Islamic State (West Africa) - Lake Chad Faction and/or Boko Haram - Jamaatu Ahli is-Sunnah lid-Dawati wal-Jihad
actor2: Military Forces of Nigeria (2015-)
location: Yau
notes: On 11 May 2020, Boko Haram/IS claimed to have repelled an attack by the Nigerian Armed Forces in Yau (assumed to be Yau in Abadam LGA, Borno).