29 April Beginning this date RVNAF and U.S. Army forces conducted search and destroy operations in a dozen base areas in Cambodia adjoin�ing II, III, and IV Corps in South Vietnam. A U.S.-Vietnamese naval task force also swept up the Mekong River to open a supply line to Phnom Penh, the Cambodian capital.

1-31 May The VC progressively returned to guerrilla warfare and terrorism in 1970. During May the VC in Quang Nam killed 129 civilians, wounded 247, and kidnapped 73. Most of the latter was interpret�ed as being forcible recruitment of young males.

3 May III MAF approved a 1st Division request to demolish the Da Nang Antiinfiltration System (DAIS), the line of minefields, cleared land, barbed wire fences, and electronic sensors which had been deve�loped to stop enemy infiltration of the Rocket Belt. Never fully constructed or manned, the DAIS was regarded as ineffective by most Marines because farmers and water buffaloes could not be distinguished from rocket-bearing enemy.

4 May Four students at Kent State University in Ohio were killed by sol�diers of the U.S. National Guard who had been called to halt riots which were stimulated in part by the Cambodian invasion.

4 May The Senate Foreign Relations Committee accused President Nixon of usurping the war-making powers of Congress by allowing Ameri�can troops to participate in the rvnaf's invasion of Cambodia. A day later President Nixon responded, saying American troops would penetrate no further than 19 miles and would be withdrawn by 1 July 1970.

6 May Que Son District Headquarters in Quang Nam Province received some 200 rounds of mortar fire followed by a ground attack of an enemy force estimated at greater than battalion strength. Marines of Company H, 2d Battalion, 5th Marines, supported by artillery aided the beseiged RF/PF units- Friendly losses were 11 killed, in�cluding one American, and 41 wounded; 27 enemy were killed.

11 June To terrorize the villagers of Phu Thanh�a village near the Ba Rcn Bridge where CUPP team Number 9 of 1st Platoon, Company A, 7th Marines operated�elements of the V-25th Main Force Battalion and the T-S9th Sapper Battalion (VC) attacked at 0200, killing 74 civilians, many of them women and children, wounding 60 serious�ly, and destroying 156 houses.

11 June Thanh My Hamlet eight kilometers southwest of Hoi An, was at�tacked by the VC/NVA, resulting in 150 civilians killed and 60 wounded. In destroying the hamlet the enemy left behind 16 dead.

21 June Da Nang was hit by nine 122mm rockets, killing seven civilians, wounding 19, and destroying seven houses.

30 June The Naval Support Activity Da Nang was deactivated and the fol�lowing day Army-Marine service support agreements went into effect.