actor1: Military Forces of Nigeria (1999-2015)
actor2: Islamic State (West Africa)
notes: On 22 April 2015, a Boko Haram landmine kills a soldier and three from a local armed group in Sambisa Forest (Gwoza, Borno), causing the soldiers to retreat.
target_text: actor1: Military Forces of Nigeria (1999-2015), actor2: Islamic State (West Africa)