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The Great War (世界大戦), also known as the Battle of Jormungandr, was a conflict that officially lasted from 1 September to 2 September, S.1206. All countries of the western half of Zemuria formed two opposing military forces: Operation Jormungandr under command of Marshal Vandyck and Operation Mille Mirage under command of Lieutenant General Cassius Bright. It was the largest war in Zemuria's history, involving more than 2 million people.

Prelude

See also: Great Twilight

The Great War began once Ash Carbide had shot Emperor Eugent Reise Arnor III, having been manipulated into doing so. Chancellor Giliath Osborne framed Calvard for the attempted assassination after it was revealed that the gun Ash had used to shoot Eugent was of a Calvardian model, coupled with the apprehension of numerous Hercules members that had been sent by Calvard to spy on Erebonia.

To prepare for war, the Imperial government passed the National Mobilization Law to enlist men ages 19-45 into military service, which also saw the foundation of additional regiments to deal with the surplus of recruits. When the Nameless One was slain in the Gral of Erebos, it amplified the curse to reach all of Erebonia and its territories, further strengthening the populace's animosity towards Calvard.

The war efforts were opposed by several Erebonians who knew that letting the war go on undisturbed would destroy the entire world. Mildine Juzelith de Cayenne organized a group called the Weissland Army to oppose the war effort, which also consisted of all of Erebonia's enemies, concocting Mille Mirage; while it would delay the inevitable, it ensured that it would try to keep Erebonia's aggression in check for the time being.

War

The Erebonian and resistance armies clashed all across Erebonia's borders. Around this time, Prince Olivert's Operation Radiant Wings was enacted to deal with the true masterminds of the event. The plan was successful in defeating the masterminds, which immediately ended all hostilities between the Imperial and resistance armies.

Aftermath

Following the cancellation of the Great Twilight, a cease-fire was negotiated on September 2, one day after the start of the war. Through the collaborative efforts of Marshal Vandyck and Lieutenant General Bright, casualties were kept to a minimum and the cease-fire was officially realised.

Through mass-communication, Eugent Reise Arnor III announced his reinstatement as emperor of Erebonia. He furthermore reiterates to the entire world that the attempted assassination on his life was not the doing of Calvard. Heimdallr governor Carl Regnitz vigorously follows up on the emperor's words by having the Imperial Army withdraw immediately. It was expected that Calvard would follow the retreating army, but this didn't occur as their military was nowhere near as strong as Erebonia's and hence, wanted to avoid prolonging the war.

Naturally, Calvard strongly condemned Erebonia and its actions. Calvard had evacuated the area on which the first day of the war took place, so casualties on the Republican side were also kept to a minimum. President Rocksmith, by now at the end of his term, carefully responded to the situation and tried to limit the public dissatisfaction against Erebonia. His successor however put pressure on him to adopt a tougher stance, leading to the demand for astronomical indemnities from Erebonia. Governor Regnitz responded to the matter diplomatically. During the negotiations Liberl, Remiferia, and Arteria agreed that Calvard demonstrated strong self-control by not invading Crossbell after the imperial army withdrew. The indemnities were eventually paid for by the government, the imperial family, the Reinford Group, and the Four Great Houses.

Following the imperial army's withdrawal from Crossbell, negotiations started between the imperial government and Speaker Henry MacDowell. Control over the city and area were officially returned to MacDowell at once. However, the remnants of the former governor general's personal guard continued to occupy the city of Crossbell until the CSPD, CGF, and SSS launched a collaborative operation to arrest them and liberate the city.

The death of Chancellor Osborne, the instigator of the war, caused an uprising of the oppressed noble families, which in turn met with revolt of the masses. The imperial family was tasked to somehow put both parties back in their place. Another challenge the imperial family faced was that the crown prince, Cedric Reise Arnor, had willingly cooperated with Osborne. Cedric, realizing he had been manipulated by Osborne, simply disappeared. Trust was gradually restored in part due to both Alfin Reise Arnor and her older brother, Prince Olivert.

Former Governor General Rufus was arrested for his cooperation with Osborne; however, Rufus had willingly turned himself in to take the blame, seeing that his fellow Ironblood members Lechter Arundel and Claire Rieveldt, key members of the Intelligence Division and Railway Military Police respectively, would be needed to restore stability to Erebonia. They were pardoned for their crimes, but both groups lost significant standing and had to be reorganized.

Finally, the Bracer Guild was allowed to finally open its imperial branches again, including the branch in still-occupied Crossbell, after they were shutdown following the Assault on the Imperial Guilds in S.1202. High-ranking bracers through the continent came to Erebonia to assist in restoring the public order. The guild also learned that Cedric had joined Ouroboros, rumored to be an Enforcer.

Though the public had learned of Osborne's manipulation in starting the war, there were groups of imperial soldiers left dissatisfied with the war's swift conclusion, as they found the indemnities paid to be unjust, the abrupt end of the war an insult to their military and loss of friends during battle. Some of these would secretly try to amass personnel and supplies to restart the war, aided by the Ebon Defense Force after a simulacrum of Rufus Albarea took over Crossbell, though these were intercepted and stopped before they could cause any severe consequences.

Battles

	Operation Jormungandr	Operation Mille Mirage
Battle of Crossbell	Imperial Army, Crossbellan Front 2nd, 5th, 10th, 12th, 14th, 17th and 19th Armored Division 1st Air Fleet 8 Dragunov-class Railway Cannons 350,000 soldiers	Republican Army, First Line of Defense 1st-8th Area Divisions 20 Armored Aviation Divisions 280,000 soldiers
Battle of Nord	Imperial Army, Nord Front 9th, 11th and 15th Armored Division 3 Airship divisions 1 Dragunov-class Railway Cannon 120,000 soldiers	Republican Army, Nord Line of Defense 12th-14th Area Division 5 Armored Aviation Divisions 100,000 soldiers
Battle of Kreuzen	Imperial Army, Kreuzen Front 13th Armored Division Elite jaeger corps 3rd Airship division 1 Dragunov-class Railway Cannon 70,000 soldiers	Republican Army, Kreuzen Line of Defense 11th Area Division 2 Armored Aviation Divisions 50,000 soldiers
Battle of Liberl	Imperial Army, Liberlian Front 1st and 16th Armored Division 2 Airship Divisions 1 Dragunov-class Railway Cannon 100,000 soldiers	Royal Army, Liberlian Blockade 120,000 soldiers
Battle through the north	Imperial Army, Remiferian and Oredian Fronts 6th, 8th and 18th Armored Division 2 Airship Division 1 Dragunov-class Railway Cannon 120,000 soldiers in total	Remiferian and Oredian Blockades Remiferian Army Arteria's Papal Guard Ored's volunteer army Leman's volunteer army 130,000 soldiers in total
Battle through the south	Imperial Army, Advance through Titith Bay 1st and 2nd Naval Fleet Imperial Marine Corps 2 Airship Divisions 120,000 soldiers
On standby	Reinforcements for the Invasion of Liberl 4th Armored Division 2 Airship Divisions Reinforcements for the Invasion of Remiferia 3rd Armored Division 2 Airship Divisions Newly established 20th-25th Armored Divisions in reserve 350,000 soldiers in total
Others		Independent Ambush Squads Weissland Army Elite jaeger corps Rebel Forces from Crossbell Jurai North Ambria 140,000 soldiers in total