At the end of 979, Dinh Tien Hoang and The Prince Dinh Lien were assassinated. In May 980 (solar calendar), the Song Dynasty porcelain at Dai Co Viet, Lu Tap, returned home to report; Song Dynasty knew the situation was confusing in Dai Co Viet. In August 980, Hau Nhan Bao, the governor of Ung Song of Dai Song, presented a letter to Emperor Tong who reported that Dai Co Viet had a rebellion and an opportunity to capture and ask to return to the capital to present clearly. than. Emperor Dai Song followed the advice of Lu Da Ton  not to summon Hau Nhan Bao to return to the capital to keep the conquest of Dai Co Viet a secret. [3] Instead, Hữu Tràng was the governor of the Quảng Nam Tây Highway (in today's Guangdong and Guangxi regions) called to the capital to report the situation of Đại C Việt. Huu Trang replied: "In Giao Chau, the last king of Dinh family was Dinh Toan who was still young, was attacked by the enemy, the country was still in turmoil, the people did not know who to rely on. We should send the wrong army to, saying that to save ... ". 

Having grasped the situation of Dai Co Viet, Tong Thai Tong appointed Hau Nhan Bao to make Giao Chau Waterborne route of transporting porcelain, Ton Toan Hung, Tran Kham To, Luu Trung and Gia Thuc held the position of Military Soldiers immediately. prepare for war with Dai Co Viet. At the same time, the projection conquered Dai Co Viet. The content is as follows: 

“The puritanism and statues of the country resounded everywhere, recently the Dien-Chi land, not yet merged into the Chinese map, they were in one direction, near the Ngu Linh area. From the end of Tang's reign, the people shared great land, and then they made a puppet country, far away from the spear into the custom as a blind and deaf child. Promptly when Phien-Ngung was pacified, he gave it to Chinh-Soc and obeyed. Worship of the upper country, could it be like that? So we are reluctant to have to treat falsehoods to save people, to send soldiers to fight over the land of barbarians; now let Ton Toan Hung go to the army to fight. ”
The projection shows that the fact that King Dinh and the prince were assassinated was unrelated to the fact that Dai intended to conquer Dai Co Viet.

In the fall of 980, the governor of Chau Lang (Lang Son) informed the court that the Song army was about to attack Dai Co Viet. Le Hoan ascended the throne and quickly prepared for a resistance. [6]

In the winter of 980, Song Dynasty sent a letter to declare war. In the letter, "We have now repaired the army and the army, the gong command is very strict; if obeyed, it will be forgiven; if we oppose the order, we will be punished". 

On the one hand, Le Dai Hanh prepared a resistance war, on the one hand, still sent a messenger to the Dai Song court to report the establishment of Dinh Toan to succeed Dinh Tien Hoang. Song Dynasty did not agree.Tong Thai Tong sent Lu Da Ton a letter to answer Le Hoan. The message has paragraph: 

#hoctot

The US "Special War" strategy until early 1965 was deemed bankrupt. Facing the collapse of Saigon's regime, the US hurriedly sent American troops to directly fight in the southern battlefield.

On May 7, 1965, the US Marine Corps landed in Chu Lai. On May 17, 1965, an American company stationed at Nui Thanh - a cluster of hills with a length of 1,200m, a width of 600m, a height of 50m, about 6km from the coast, 4km from Chu Lai airport. Nui Thanh consists of two hills 49 and 50 connected in the middle of a 200m long saddle. They set up the system of underground tunnels, fortified fortifications, outside covered with gigantic barbed-wire fences. From this base, you can observe the whole Chu Lai airport to the sea, as far as Doc Soi (South - Ngai border).
 
Facing this situation, the Command of Zone V decided to choose Quang Nam, specifically Nui Thanh, as the first place to implement the determination to "beat the US to defeat the US".
Quang Nam province team was assigned to perform this task. 2nd Company of Battalion 70 was assigned to conduct research and organize the battle. On May 25, 1965, the combat plan was submitted to the superior and approved.

At 18:00, on May 25, 1965, the order to start the army started. Based on the obscure terrain, our advancements all approached safe targets. At 0 o'clock, all directions fired, attacked and attacked the Americans, deepening, besieging and separating to destroy the enemy.

In just 25 minutes of fighting, our troops occupied both hills 49 and 50, destroying all enemy troops. The flag "Decisive battle, determined to conquer American invaders" was raised on the top of Nui Thanh.

At the Congress of Heroes, Southern Emulation Soldiers, the Vietnam National Liberation Front and the Southern Military Commission, unanimously commended the three provinces for the best achievements in the anti-American career (1954-1967). , the following titles:

1- Ben Tre "The brave fellow started, defeated the Americans to defeat the puppet".

2- Long An "Trung valiant, tenacious, all people fight the enemy".

3- Quang Nam - Da Nang "Trung valiant, resilient and leading to destroying America".

Today, on the hill east of Nui Thanh 43m high, near the National Highway 1A, a majestic monument bearing the words "Victory of Nui Thanh" has been built marking an indomitable feat of the army and people. Quang Nam - Da Nang during the resistance war against the US.