|First Han Civil War|
|Part of the Cold War|
| Great Han Empire|
| Han People's Republic|
|Commanders and leaders|
| Yi Ling|
| Jang Jinmyou|
|Casualties and losses|
The First Han Civil War (Han: 的战争韩; 서전쟁한, tr. Soujounjéng Han) was an armed conflict between the capitalist Great Han Empire and the Marxist-Leninist Han People's Republic–which were centred on the islands of Ruson and Solwoun, and Shonanmin respectively–which lasted from 8th February 1945 to 5th September 1948.
The war was initiated following the Hanyang Declaration and the withdrawal of American troops from the Han archipelago after the end of the Second World War. With China resuming its civil war, and Korea being exhausted from Chinese invasion and Japanese separatist movements, the southern communists took this chance and invaded the North, quickly overrunning the central islands and the Anyang peninsula. At the time, much of the North faced communist insurgencies and sympathised with communist ideals. Within a year, Hanyang was captured and the North was restricted to the northern half of Ruson. However, an ambitious amphibious assault was launched on the Anyang peninsula, with the North pushing to reach the city of Sanwouga. The South eventually resisted the Northern invasion up until the former North–South border, and for the next two years, the situation would become a stalemate.
In 1948, after three years of fighting, a ceasefire agreement was signed in the city of Sénban. Despite this, the agreement was broken on numerous occasions, most notably during the brief Second and Third Han Civil Wars. For most of the remainder of the Cold War, both sides continued to have hostile relations with each other; actively denouncing each other and enticing people to defect to the other side through the use of propaganda.
It is regarded as one of the first major conflicts of the Cold War, and is largely responsible for exacerbating the capitalist–communist divide within Asia. It also saw the United States and the United Kingdom participate in the first major armed conflict since the end of the Second World War, as well as the establishment of Hani as a firm ally to the West. Korea also was able to affirm its status as both a regional and global player, and later leading the formation of the Greater East Asia Co-Prosperity Sphere and the Hanyang Pact as a bulwark against future communist aggression.
Since the late-seventies, both governments had announced efforts to reconcile with each other. Diplomatic relations were normalised, and an economic bloc was formed between the two during the eighties. In the 30th June 1991, the southern government finally capitulated to the North after its defeat in the Third Han Civil War.