New Territories

The New Territories, officially the New Mainland Territories of the Greater Empire of Yamatai (大山都帝国の新本土領土), also known as Yamataian Chisei and Occupied Chisei, was a colonial state created by Imperialist Yamatai in the early 20th century, occupying the western coast of Chisei. The New Territories were governed by the the Greater Yashiman Affairs Office and the Governor-General of Chisei, a military official who sat on the Yamataian Imperial High Council and reported directly to the Imperial Grand Marshal of Yamatai. The capital of the New Territories was Wanshu for much of its existence, but moved briefly to Amagishi. Yamataian occupation of the New Territories lasted from 1923 to 1943.

During the First Escar-Varunan War, Yamatai landed on mainland Chisei. Following the Yamataian victory in the war, the occupied areas were ceded to Yamatai in the humiliating Treaty of Wanshu in return for an end to the war. The invasion and occupation of part of Chisei was in part due to Yamatai's desire to humiliate and dominate their long-time rival on the mainland, with a full takeover of Chisei not feasible at the time due to the precarious military situation Yamatai had been in during the war, unknown to the Chiseian government that signed the treaty. The occupation of Chisei was justified by the Yamataian government under the Yashiman nationalist idea of Izoku Kyowa, which favoured a unification of the peoples within the Yashiman ethno-linguistic group. The Yamataian occupation of the New Territories was welcomed by some Chiseians who subscribed to Izoku Kyowa.

The Yamataian occupation of the New Territories saw the heavy militarisation and industrialisation of the region and a forceful shift towards a homogenised Yashiman culture dominated by Yamataian characteristics. Many traditional Shirakawan and other Chiseian artefacts were looted from the region and brought to museums on the Yamataian islands. Thousands of civilians were also recruited into military and civil engineering forces deployed throughout the Yamataian empire for construction work, though the conditions in the New Territories were considered to not have been as draconian as in the other Yamataian territories. The Yamataian military also prepared the New Territories to be the eventual base for a full-scale conquest of the rest of Chisei. Tensions between Chisei and Yamatai along the entire border were high throughout the existence of the territory, and border skirmishes occasionally occurred between opposite patrols along what became one of the most militarised borders in the world at the time.

Regaining control over the New Territories was a high priority of the Chiseian Conciliar Government, which eventually developed Operation Hiyari, a plan for a wide-ranging war across the entire Yamataian empire in a bid to reclaim the New Territories and settle the long-standing rivalry in Chisei's favour. Though information on the plan was obtained by the Yamataian government after the Nakanogō Incident‎‎ in 1936, the plan would be launched to great initial success on 7 July 1937, beginning the Second Escar-Varunan War and almost pushing the Yamataian forces off of the mainland. However, a subsequent counterattack by Yamatai allowed them to extend their hold on the New Territories. The government of the New Territories was moved from Wanshu to Amagishi following the Yamataian loss of the city in the Third Battle of Wanshu in mid 1942.

The New Territories ceased to exist on 15 May 1943 with the Yamataian defeat in the Second Battle of Amagishi, when the final major concentration of Yamataian forces on the mainland surrendered, though the Greater Yashiman Affairs Office and the position of Governor-General of Chisei continued to exist for some time afterward before their formal dissolution in August 1943. Some small pockets of Yamataian troops remained on the mainland after 15 May 1943, but were too insignificant to be considered a continuation of Yamataian administration over the New Territories.

Government
Like the rest of the Yamataian Empire, the New Territories were divided into military districts, each governed by a military officer who reported directly to the regional governor, who in the New Territories was the Governor-General of Chisei. There were four military districts in the New Territories, with three administered by the Imperial Army and one administered by the Imperial Navy.

These districts were the Northern Command District under Lieutenant-General Kitagawa Ryōichi, the Shirakawa Command District under General Kishitani Shūgo, the Gyōsho Command District under General Inaba Youji, and the Nishijima Command District under Rear-Admiral Yamanaka Momoko.

Military
Besides the Yamataian military forces stationed in the New Territories, a local force consisting of a mixture of selectively conscripted and volunteer troops known as the Imperial Army of Chisei was also raised. Comprised almost entirely by Chiseians, the upper echelons of the Imperial Army of Chisei were made up of collaborationist Chiseians who were loyal to Yamatai, though Yamataian advisors, commissars, and officers were also incorporated into the lower command structure. Corruption, nepotism and black marketeering were major problems in the Imperial Army of Chisei prior to the war. During the war, desertions and mutinies in the lower ranks were common, as well as horrendous tactical blunders by inexperienced commanders lacking military skills. Despite the existence of the Imperial Army of Chisei, Chiseians were also conscripted into the regular Yamataian Imperial Army in the waning months of the war.

Following the defeat of Yamatai on the mainland, the remnants of the Imperial Army of Chisei continued to fight for Yamatai during the Invasion of Hinomoto up to the end of the war, when it was quietly disbanded. Many of the high-ranking Chiseian officers were returned to Chisei to face trial as stipulated by the Treaty of Senbonzakura, though some also managed to escape to Yamatai or elsewhere. The final commander of the Imperial Army of Chisei and one of the most wanted Chiseian fugitives in the 1940s, General Nonaka Midoriko, changed her identity and retired in the Yamataian countryside before being uncovered and assassinated in 1968.

Interbellum years
Golden River Period