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Great War (世界大戦) was a war that 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.


See also: Great Twilight

The Great War began to set 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 Juzalith 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.


The Erebonian and resistance armies clashed all across Erebonia's borders. Around this time, Prince Olivert's Radiant Wings plan was initiated 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.


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 his majesty'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, Reinford Group and the Four Great Houses.

Following the imperial army's withdrawal from Crossbell, negotiations started between the imperial government chairman Henry MacDowell. With no regard for the Government-General Security Force, control over the city and area were returned to MacDowell at once. Anxious of another invasion from Calvard, along with the arrest of the governor-general Rufus Albarea, security was reinstated to the Crossbell Guardian Force and civilian volunteers. The Government-General Security Force that disturbed the Orbal Network were soon overpowered. Crossbell was liberated at the hands of volunteers, with key figures from the Special Support Section at its centre.

Not only external, also internal difficulties had to be overcome by Erebonia. 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, head 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 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.

Despite Osborne's manipulation to instigate 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. They attempted to restart the war by themselves, but all of these attempts failed.


Operation Jormungandr Operation Mille Mirage
Crossbell Emblem.png 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
Erebonia Crest.png 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
Liberl Crest.png 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
Remiferia Emblem.png 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
Liberl Crest.png Battle through the south

Imperial Army, Advance through Titith Bay

  • 1st and 2nd Naval Fleet
  • Imperial Marine Corps
  • 2 Airship Divisions
  • 120,000 soldiers
Erebonia Crest.png 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


Independent Ambush Squads

  • Weissland Army
  • Elite jaeger corps
  • Rebel Forces from
    • Crossbell
    • Jurai
    • North Ambria
  • 140,000 soldiers in total