Chad is to pull its peacekeepers from an African Union mission in the Central African Republic (CAR) in protest at claims that they aided rebels.
A statement from the Chadian foreign ministry said its troops had been criticised despite their sacrifices.
Chad has contributed roughly 850 soldiers to a 6,000-strong contingent.
Its forces have been accused of siding with Muslim rebels whose ousting of the CAR government last year was followed by a wave of religious violence.
The rebels, who call themselves Seleka, seized power last March. Their leader stepped down in January amid spiralling attacks and counter-attacks between groups claiming to represent different faiths.
Recently, thousands of Muslims, a minority in CAR, have been fleeing to neighbouring Chad and Cameroon after being targeted by Christian militias.