Marines and causing an artillery battle with a Thai warship offshore. 7 December: Vietnamese troops warned Thailand against continuing to support Cambodian guerrillas. A loudspeaker broadcast and leaflets shot from cannon near Aranyaprathet District appealed to Thailand to refuse sanctuary to the guerrillas and warned that it would bear the "consequences" if it refuses. 1987 25 March: Thai Army Commander-in-Chief General Chavalit Yongchaiyudh announces an all-out offensive against Vietnamese troops who have intruded into Thai territory beyond the set 5 km limit. 17 April: Thai forces tried to oust Vietnamese infantry from Chong Bok, a mountainous region where the borders of Thailand, Laos and Cambodia converge. Casualties in double figures are reported on both sides. 30 May: Thai Rangers patrol the Chong Bok region where fighting has raged to dislodge Vietnamese from entrenched positions just inside Thai territory. Mid-1987: The 800-kilometer Thai-Cambodian border was fully garrisoned by Vietnamese and Cambodian forces. 1988 22 April: Vietnamese troops crossed the border and ambushed a company of border police, killing four Thai soldiers and wounding another. The company of five Thai police was patrolling a strategic point near the border in Buriram Province, 174 miles east of Bangkok, when a Vietnamese soldier hurled a grenade into the group and opened fire with rifles. The Vietnamese soldiers were more than 500 yards inside Thai territory when they staged the attack. 12 June: At about 9 a.m., Vietnamese 105mm and 85mm artillery shelled a Thai village, killing two villagers and wounding two others. Six artillery shells struck four miles deep inside Thailand. 4 August: The leader of the Chart Thai Party, General Chatichai Choonhavan, becomes the 17th Prime Minister of Thailand, he promises "to turn battlefields into market places". 1989 26 April: Vietnamese troops fired four artillery shells into Site Two, the largest of the Cambodian refugee camps with a population of more than 198,000. Three people were severely wounded. After the shelling, the camp was reportedly closed to Western aid officials, including members of the United Nations Border Relief Operation, which provided aid for the camp. September–December: Vietnamese troops withdrew from Cambodia. See also K5 Plan Battle of Rạch Gầm-Xoài Mút Siamese–Vietnamese War (1831–34) Siamese–Vietnamese War (1841–45) Notes External links Wars of Vietnam: From the Beginning of the 20th Century to the Present Thai-Cambodian Border History in detail 20th century in Thailand 20th-century military history of Thailand Military history of Vietnam Wars involving Thailand