A mysterious, ancient-looking gate appeared in Washington, D.C., sometime in the 21st century.
From the gate poured out monsters, knights from medieval Europe, and other fantasy-like beings, and they began a systematic slaughter of the citizens of the U.S. capital, laying siege to the White House.
For the first time since the War of 1812, the streets of the United States became a battlefield.
Due to their unrestrained arrogance, the Empire of Sadera immediately sought to claim the lands on the other side of the gate.
However, they would soon realize just how inferior their own military truly was.
Once the U.S. military mobilized, they attacked the invaders with their advanced technology, forcing only a thousand of them to retreat while killing or capturing the rest.
This unprovoked attack on U.S. soil, not seen since September 11th, 2001, would be known as the "Washington Incident."
In retaliation, the U.S. government sends the United States Marine Corps to the alternate world beyond the gate, thus beginning the American-Saderan War.
We will follow certain groups of people from both the nations of Earth and the kingdoms of Falmart to set the stage for the bloodiest conflict Falmart has ever seen.
It's the end of Battle of Belleau Wood, but as the final Germans surrendered to the marines, a massive portal opened in the middle of Belleau Wood and in the middle of the Atlantic Ocean. The world stood shocked as the portal spewed out black creatures... Grimm.
After the loss of an estimated 10,000~ soldiers the countries had decided to end this war and to take the fight to the monsters who wreaked havoc across the battlefield, not realizing it was a portal to a whole new world. Together forming the earliest version of the UN, instead called the 'United Monarchies and Democracies of the World' or the UMDW.
Now let's watch as the countries march and fight their way through the new world.
(A/N) Some changes will be made to the WW1 timeline, but 99% is accurate.
All rights belong to Rooster Teeth.