evidence: BANGKOK, Jan. 4 -- The Thai army was placed on high alert status Thursday after a peace agreement between Shan warlord Khun Sa and Rangoon brought Thai and Burmese forces close to confrontation. The surprise cease-fire between Burma's military government and Khun Sa's Muang Tai Army removed what had for decades been a strong buffer between historic enemies Thailand and Burma. The agreement also highlighted conflicting border claims over Doi Lang, a mountain which until Tuesday had been occupied by Khun Sa's private, opium-financed army. 'There are a number of Burmese soldiers on Doi Lang now,' a high- ranking Thai army officer told United Press International. 'We have enough men at the border and we are superior in terms of air power. We also have more powerful artillery units.' The Thai officer, who spoke on condition on anonymity, said Thai border units were put on high alert status Thursday after reports of troop movements on Doi Lang. Additional artillery and infantry forces have moved into the border area, 420 miles (672 km) north of Bangkok, over the past two days, military sources said.