Army spokesman Azem Bermandoa Agouna tallied "several hundred rebels neutralised (and) 66 taken prisoner" while six soldiers were killed.
Chad calls for international support to help Africa's beleaguered Sahel region as leaders of Burkina Faso, Mali, Mauritania, Niger, and France attend summit in Chadian capital N'Djamenaas to discuss future of their military operation.
Their deaths brought to 50 the number of French soldiers killed in the nation since France first intervened in 2013.
Senior AU official says decision taken because militant "threat is expanding" in Sahel, a semi-arid strip below Africa's Sahara desert.
The Sahel region sees a tenfold increase in the number of deaths in militant attacks while France urges other countries to do more.
The German chancellor is visiting countries that contribute heavily towards migrant flows heading to Europe, and that has many questioning her motives.
Friday's attacks in Ouagadougou on the French embassy and the country's military HQ left 12 people seriously injured while eight assailants were killed, along with the soldiers. A Mali-based affiliate of al Qaeda claimed responsibility.
European leaders will double their funding for a force tackling militants in the Sahel. Meanwhile, the bloc has discussed how it will cope with a multibillion-euro hole in its budget caused by Brexit.
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