The Sambisa forest, covering about 1,300 square kilometres , is a stronghold of the notorious jihadist group, who kidnapped more than 200 schoolgirls in 2014.
"During our operations in the period 14 - 21 December 2016, a total of 1,880 civilians were rescued from Boko Haram enclaves," Major-general Leo Irabor said in a statement after a news conference in the northeastern city of Maiduguri yesterday .
He said the operation was part of a military campaign launched last year to clear the area of the jihadists.
He said several Boko Haram fighters were killed and a cache of arms and ammunitions was discovered.
Boko Haram seeks to impose a hardline Islamic legal system in Nigeria's mainly-Muslim north.
It has been blamed for the death of at least 20,000 people since 2009. The rebellion has also displaced some 2.6 million people, sparking a humanitarian crisis in the region.
Since early 2015, Nigerian military with the support of a regional force, have recaptured a swathe of territory from the insurgents.
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