<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.mapema mwaka huu vikosi vya chad vilichukua jukumu kubwa la kuichukua miji na vijiji vilivyotekwa na kundi hilo kaskazini mashariki mwa nigeria.  <response>: earlier this year, chadian troops played a key role in a regional effort to retake towns and villages held in north-eastern nigerian by boko haram. 