Troops backed by warplanes move into Sambisa forest
Militants were thought to be hiding Chibok girls there
Boko Haram has been pushed out of much territory
Chad, Cameroon expected to join attack soon (Adds Cameroon army source, detail)
By Ardo Abdallah
BAUCHI, Nigeria, April 22 (Reuters) - Nigerian forces backed by warplanes invaded Islamist group Boko Haram's last known stronghold, the Sambisa forest, on Wednesday, in an effort to finally defeat their six-year-old insurgency, two military sources said.
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