The Paris Peace Accords were signed on 27 January 1973. The fighting at Trung Nghia began, by most accounts, that same day. North Vietnamese forces attacked the village and the adjacent position at Polei Krong even as diplomats in France were affixing their signatures to the ceasefire agreement. This was the "War of the Flags" — the frantic post-ceasefire land-grabbing in which both sides raced to plant their banners on as much territory as possible before the shooting formally stopped. At Trung Nghia, situated near the confluence of the Dak Bla and Krong Poko rivers about 17 kilometers west of Kontum, the race would continue for another eight months.
Trung Nghia's military significance was geographic. The village sat astride north-south lines of communication in Kon Tum Province, close enough to Kontum City to serve as a staging point for any major offensive against the provincial capital. Polei Krong, the adjacent position that fell to North Vietnamese forces on 28 January 1973, controlled an even more important corridor. Whoever held these two points controlled movement through a significant portion of the western highlands.
The People's Army of Vietnam (PAVN) had taken Polei Krong quickly and intended to keep it. Through the spring of 1973, artillery from the PAVN's 40th Artillery Regiment — 130mm guns and 122mm rockets — steadily wore down South Vietnamese firebases and positions northwest of Kontum. By early June, two PAVN 130mm guns had been moved into position. The Army of the Republic of Vietnam (ARVN) 53rd Infantry Regiment's positions came under sustained bombardment. The ground assault came on 7 June.
The PAVN attack on 7 June was coordinated and powerful. Battalions from the 66th Regiment and the 24th Independent Regiment advanced under the support of at least ten T-54 tanks and continuous artillery fire. South Vietnamese Regional Force troops and elements of the ARVN 44th Regiment were driven from their positions. The PAVN gained control of Trung Nghia and its surrounding heights, including Ngoc Bay Mountain, whose slopes provided observation over the entire area.
From that high ground, PAVN forward observers could direct fire onto any ARVN formation attempting a counterattack — and the South Vietnamese attempted many. Through July, the 44th Regiment pushed against the entrenched PAVN defenses, gaining meters at a time before being stopped by fire from the mountain. Massive artillery preparations and repeated air strikes preceded each assault. None of them broke through. By the time the southwest monsoon arrived in full force in August, both sides had settled into a grinding attrition that favored the defenders.
Warfare in the Central Highlands has always been shaped by weather. The southwest monsoon, which rolls in from the Indian Ocean and drops heavy rains across the highlands from roughly May through October, grounded aircraft and degraded the aerial observation that South Vietnamese forces depended on to direct their fire. North Vietnamese commanders understood this. The PAVN moved forces in daylight during August, confident that low clouds over the highlands would keep South Vietnamese spotters blind.
The ARVN attempt to outflank the Trung Nghia position from the south — attacking through Plei Mrong toward Plei Djo Drap, directly across the Dak Bla River from the village — ran into fierce resistance. The PAVN 28th Reconnaissance-Sapper Battalion launched seven separate attempts to destroy the camp at Plei Mrong during the week of 4–10 August. A battalion of the 95B Regiment hit the ARVN 22nd Ranger Border Defense Battalion just north of Plei Mrong and was repelled, leaving 150 dead. Through August, fighting continued across this sector. Despite absorbing estimated losses of nearly 200 killed, the 95B Regiment succeeded in blocking the ARVN's approach to the Dak Bla River.
By September the stalemate was broken not by greater firepower but by a change in method. The exhausted 44th Regiment had been replaced by the 42nd Regiment, 22nd Division, flown to Kontum aboard C-130s from Binh Dinh Province. The 42nd brought fresh eyes to a problem that months of frontal assault had failed to solve.
Rather than massing troops against the PAVN line and charging, the 42nd worked methodically — platoon-sized assaults against individual bunkers, supported by 81mm mortars firing delayed-fuze rounds that stripped away overhead cover before the assault went in. The technique worked. Prisoners captured during the final push confirmed that it had been devastatingly effective. The PAVN 28th Regiment, already depleted and weakened by malaria — casualty rates in some units ran as high as 60 percent from illness alone — could not hold against this kind of patient pressure. By 1 September, the regiment was withdrawing northward along the Poko River, leaving behind its wounded. Trung Nghia was cleared by 7 September. Polei Krong fell on 16 September. The three-month battle was over.
Trung Nghia lies at approximately 14.382°N, 107.896°E, west of Kontum City in Kon Tum Province. The confluence of the Dak Bla and Krong Poko rivers — a key tactical feature in the battle — is visible from altitude as two river systems meeting in the valley floor. Kontum (Kon Tum) is roughly 17 km to the east. Pleiku Airport (VVPK) lies approximately 45 km to the southeast and is the nearest airport with regular service. The Central Highlands plateau rises visibly from lower surrounding terrain. Best viewed at 8,000–12,000 feet AGL for the full river confluence and valley context.