The Erdlingen War (エルトリンゲン戦役) was a conflict between the Romun Empire and the Kingdom of Gllia.
The Erdlingen War is an important historical event in Ys IX: Monstrum Nox as it affected the lives of Yufa Gamberg and Chatelard.
Course of the war
Eight years before the start of Ys IX: Monstrum Nox, the Romun Empire invaded the Kingdom of Gllia in order to annex it into the ever-growing empire. Imperial forces dominated the war from the beginning until the end. Following a large-scale battle on the outskirts of Balduq, the 4th Battalion, commanded by General Bourdon of the Gllian royal family, suffered defeat. The general retreated from the battlefield into the safety of Balduq's walls. The Romun army, with a victory in sight, pursued him without mercy, and in mere moments, Balduq was besieged by one of the Romun generals—the Roaring Leo.
The 4th Battalion was outmatched and desperate, for its provisions were depleted, and the city was being overrun by riots and pillaging from within. Knowing they wouldn't last, Chatelard, who was stationed with a company that chose to obey orders and stand their ground, executed a plan that would turn the tide of battle.
He would collaborate with local militia to launch surprise attacks, taking a small number of troops and sneaking past the siege under the cover of night. Under the guise of reinforcements using flambeaus, they would ambush the Romun army. In response, the 4th Battalion agreed to advance and launch a pincer movement. The maneuver was set into motion, and the stationary troops engaged the rear guard. The disarrayed Romuns struggled to respond.
The troops waited for the 4th Battalion, but the Balduq gates never opened, and the 4th Battalion never emerged. The cowering General Bourdon leading the local militia changed his mind and ceased his support, which lead to a crushing defeat of the stationed troops. The Romuns regained their composure and retaliated, making quick work of Chatelard and his company. Balduq's stationary troops were comprised of young, talented men. In all but an instant, all of Chatelard's trusted comrades were annihilated.
The Gllian royal family immediately surrendered to the invading imperial forces. In the rashness of the Romun army to seek fame, it was publicly announced that the castle was capitulated bloodlessly. The war ended with victory for the Romun Empire.
Aftermath
The war left the Kingdom of Gllia in ruins and it was subsequently annexed into the Romun Empire as a province. The royal family fell, with the king dying in battle. His only daughter, Princess Eleanor, went missing.