Entering the Star System, the Qwriohl Mother Ship had no plan of stopping. Pretty soon, it hit the atmosphere of the Earth, plummeting downwards as pure oxygen in the air caused it to be engulfed in flames. It was like a crashing alien spaceship, except it wasn't alien due to humans being on board.
At that point, there was nothing else left for everyone to do. Sirius had already sent the warning all across the globe, and their weaponry had already been opened. And it was the same for every other city and country out there. They too opened their weaponry and armed everyone readily available for war.
When the Qwriohl Mother Ship arrived at the peaceful Alpha Star System, it was an instant case of a declaration of war, and the citizens of Earth Alpha, who are part of the bigger whole as a Union, wouldn't just sit down while their freedom was being threatened. Thus one by one, every abled citizen was called to take up arms. This meant war to everyone.
