Eastern Region Commander Vibulsak Neepan said troops from both sides had retreated slightly but were facing off about 100 meters apart and
"The situation is quite tense at the front line," Lieutenant-General Vibulsak told Channel 3 television.
"We have mobilized more troops and heavy artillery to the area, just enough to resist and retaliate."
His comments came shortly after Cambodian commander General Chea Mon told Reuters by telephone from the border that nearly 100 Thai soldiers alleged to have made an incursion onto Cambodian soil had retreated.
"The situation seems to have returned to normal," he said. "Our troops are occupying the area where the Thai troops have pulled out."
Vibulsak admitted Thai soldiers had entered a disputed "no-man's land" on the border after getting permission from the Cambodian side, as is normally required, but said they were only there to inspect landmines.
On Monday, Cambodian Prime Minister Hun Sen threatened to turn the area into a "death zone" unless the Thais retreated by midday Tuesday (0500 GMT).
The Thai military said it was ready for war and the Foreign Ministry told Thais to "think twice" before visiting
Tensions have been high since July, when 2,000 soldiers faced off only yards apart in trenches dug into a hillside that until 10 years ago was under the control of remnants of the Khmer Rouge, Pol Pot's guerrilla army.
At the heart of the dispute is 1.8 square miles (4.6 sq km) of scrub near the temple, which the International Court of Justice awarded to Cambodia in 1962, a ruling that has rankled in Thailand ever since.
The dispute flared in July after protesters trying to overthrow the Thai government attacked