A spokesman for the anti-government alliance told the AFP news agency that it was government forces that started the fighting and denied that his forces had been defeated.
"There was fighting between government forces and men of the CNT [Chadian National Concord], but it's over and the CNT is still in control of the area," Maide Id Moura said.

Casualty figures

The government of  Idriss Deby, the president, said exact casualty figures for the rebel forces were not yet available but 38 of their vehicles had been destroyed.
"Sudan has not abandoned its sinister project of destabilising Chad"

Chadian government statement
The Chadian National Accord said anti-government forces had lost only three vehicles and 10 men, while destroying 35 government vehicles and killing numerous soldiers.

Last week, the Chadian National Concord accused the army of attacking its positions 30km from the Sudanese border with helicopter gunships.
The previous weekend, clashes between local groups in the east resulted in more than 100 deaths, provoking intervention from Chad's army.

N'djamena accused the Sudanese government-backed Janjawid militia of involvement in those attacks.

Meanwhile, Al Jazeera's correspondent in Khartoum quoted government officials as saying that 17 Sudanese soldiers had been killed in an attack by Chadian forces in Sudan.

Chad and Sudan signed a non-agression pact two months ago but frequently blame each other for supporting anti-government forces in their respective countries.

"Sudan has not abandoned its sinister project of destabilising Chad," the government said on Monday, calling on the population "to rally more than ever behind the defence and security forces to preserve their democratic gains, and guarantee sovereignty and territorial integrity".