In the first days of 2089, we were filled with hope. A new century was on the horizon, space flight was getting more and more advanced, and medicine was capable of healing many diseases and ailments that a century ago would have been terminal.
Then one day, the major nations of the world, including the United Americas, United Europe, Russia and China all detected a massive assortment of objects quickly speeding to Gaia, far too quickly to be asteroids. Not long after the clock ticked over to 2090, when our space stations and satellites were destroyed, we knew...we were under attack.
The First Contact War began.
The arachnoid aliens we came to call the Tyrum bombed our world from orbit, leveling entire cities. Tactical nuclear strikes against their ships proved useful, but only served to offer temporary rest. When the Tyrum landed their ground forces, they began slaughtering every man, woman and children they found. This wasn't a war for our resources or land.
It was a war to purify the galaxy.
South America, the Koreas, Japan and eastern China were hit the hardest, almost completely destroyed within the first weeks of the ground war. The United Americas and Russia, while taking heavy damage, managed to fight back the most effectively. Some areas like Scandinavia and Australia were spared large scale destruction and became filled to capacity with refugees within months.
At first, the best we could do was hold out as individual countries, each military combating this new threat as if it was a foe from any other war, but this quickly proved to be foolish. Each nation gripping its own forces and resources, keeping it to itself was sure to only further sow the seeds of chaos among us. Once individual governments collapsed, the numerous militaries and civilian militia established a coalition for the purpose of sharing information, material and personnel. This step already aided in the war effort without pesky diplomatic bureaucracy barring it with red tape.
When the militaries of the world had to take control once the governments themselves either became too weak or completely destroyed, harsh new policies were established to ensure every scrap of food, every drop of fuel, every bullet, every able body was put to use. Requirements for enlistment in armed forces across the globe were relaxed to an extreme degree. Children as young as 12 years old, many orphans, were pressed into service. Individuals with disabilities were drafted and put in support roles. Former criminals were collected into "suicide squads" and sent into the most high risk combat situations. For Humanity, this was the do or die moment.
Most major cities were in total ruins, blasted rubble now the only remains of great cities like New York, Washington D.C, London, Moscow and Paris. The stench of death ever present in these places, as if the spirits of the millions slain there not knowing of their own fate, refusing to abandon their homes. More Humans died in the first few months of the First Contact War than in all other wars in the past 3000 years combined. This conflict was horrific, like a living visage of Hell spreading over the world, burning the once fertile ground a pitch black and rending the sky green as our forests and cities burned with chemical fire.