Tet Expedition

The  was a civil war in Daidieu fought between the ruling communist People's Republic of Daidieu (PRD) and the anti-communist pro-democracy activists. It was the bloodiest internal conflict in Daidieu since the Dieuese War of Liberation in the 1940s.

War was declared following student leader Hwàng Hyú's death in the morning of April 12, 1985. Regular civilians, fed up with the government's oppression, started to revolt. The military was called in and martial law was declared. The DGIE had smuggled weapons to the students and civilians, and soon the conflict esclated.

After months of savage fighting and stalemates, the activists won a decisive battle in the city of Theng Lǔk due to Vietnam's withdrawal of troops. Soon the PRD fell and on August 22, 1985, the Provisional Republic of Daidieu was declared.

Background
On the morning of April 12, 1985, a student leader in the anti-communist protests named Hwàng Hyú (黃孝) arrived at a cafe in Ning Dọ District, Vian King along with some other students to discuss the protests for the day. One of them was police informant and "friend" of Hwàng named Lí Ving Nyǐ (李榮二). Lí said he felt sick, and then asked the barista for the telephone. Ly secretly called the police, telling them Hwàng was at the cafe. When Hoang and his friends exited the cafe, they were gunned down by the police. Uproar occurred when the news broke. Regular civillans and police and the military were locked in urban warfare, and the capital Vian King was a war zone. Dictator Kim Nàu Szì declared martial law and escaped to Hanoi, Vietnam on April 14.

Spread to other cities in Daidieu
There were riots and rebellions in the cities of Kim Kụ́, Póu Kāu, and Theng Lǔk. In the mountains in northern Daidieu, gurellia fighters raided communist bases in the night. Kim Nau Szi, in Vietnam, had made many mistakes, sending his best generals to die in the battlefield. By August 1985, the activists and the government-in-exile controlled about 20% of Dieuese territory. However, it would remain that way until August 21, 1985, when the pro-democratic forces defeated the communists in the battle of Theng Luk, and soon the pro-democratic armies would advance on the capital.

End
Due to Vietnam's withdrawal of troops from Daidieu on August 17, 1985, PRS forces were quickly depleted over the next few days, and most didn't want to fight anymore. Kim Nàu Szì was angered and ordered the deaths of his top generals. Meanwhile, pro-democratic US-backed Dieuese forces, the imperial family, and the FLD were arriving in Vian King. The city's defenses quickly fell and on 8:21pm, August 22, 1985, Tạn Dàng Hìng declared the Republic of Daidieu and proclaimed himself president of Daidieu.

Aftermath
The monarchy was restored in 1986, returning Daidieu to democratic rule as the Kingdom of Daidieu. All political parties were restored, the Communist Party ceased to exist, and it held its first ever elections since 1970. Hwèi Ving (1936-2012) was crowned emperor of Daidieu. The war would also lead to the Dieuese Economic Miracle.