However, the rebel group Front for Change and Concord in Chad (FACT) said it was not aware of an end to the fighting. The group "will comment when it has reliable and credible information," said a FACT spokesman.
The transitional military authorities have claimed in the past to have defeated the rebels - only for clashes to continue.
Crowds in the capital N'Djamena cheered on Sunday as soldiers returned from the front line in a column of tanks and armoured vehicles.
"The triumphant return of the army to the barracks today heralds the end of operations and Chad's victory," the army's Chief of the General Staff Abakar Abdelkerim Daoud told reporters.
At an army base in N'Djamena, dozens of captured rebels sat in the dirt, on display for the assembled press.
Chad’s military claims victory over rebel group, displaying dozens of prisoners in N’Djamena https://t.co/9pbrQBOw2k pic.twitter.com/OdxP5S53CH
— FRANCE 24 (@FRANCE24) May 9, 2021
Tear gas
FACT fighters crossed the border from Libya in April to take a stand against Déby, whose 30-year rule they opposed.
His subsequent death while visiting troops plunged the country into crisis.
On Saturday, security forces fired tear gas to disperse a protest against the ruling military council. The council, led by Déby's son Mahamat Idriss Itno, seized power after Deby's death, promising to oversee an 18-month transition to elections.
Opposition politicians and civil society have denounced the takeover as a coup and called for supporters to take to the streets. At least five people were killed during a protest on 27 April.
- Military council in Chad names new transition government
- Chad’s leader Deby killed by rebels, son announced as interim military leader
Opposition protest postponed
Opponents had planned a further protest on Sunday but postponed it, fearing the authorities might use violence to suppress it, prominent human rights activist Mahamat Nour Ibedou told Reuters.
The military council had given permission for a protest on Sunday.
Former colonial ruler France, which has a military presence in Chad and was a long-term backer of Deby, initially signalled its strong support for the council but has since called for a civilian national unity government.
Chad is a key power in central Africa and a longtime Western ally against Islamist militants across the Sahel region.
