"...and on this grand battlefield, the aliens had their first successful battle against protonapoleon, they had learned to...

...would suffer worsening results for centuries while the aliens established themselves slowly across the south pole and up towards Australia. Eventually developing into an opening for a slaughter across much of Southeast Asia. The tall, narrow mountains are actually mass graves for the...

... the grand fortification of the majority of what is now called Tibet endured assaults and sieging unequalled in scale, but stood strong for decades. Vast swaths of territory was being lost in Africa and America, but the line at the Himalayan range practically never faltered, with the exception of smaller breaches. By this time, their very strange and interesting form of nuclear weapons technology had finally had time to enter the theater, and preparations were being made for a massive surprise attack...

...there were apparently only a few hundred outposts left, but advance forces and the rolling production and use of nuclear weapons were steadily taking them down, dozens every month. The majority of the alien empire was reduced to ash and rubble, a nuclear stockpile – vastly larger than even the modern superpowers at the height of the Cold War – was emptied in its entirety.

While the cleansing of Earth was almost done, the results required them to heavily adapt their civilization, there was heavy bunkerization of everything that was not abandoned, and expansion of subterranean production of...

...likely meant that finally, they had won, there were none left to be found. The final proper outpost was destroyed very long ago, but there were many sightings for a while after; With Alaska's search now finally being completed with no findings, there was nowheren left to look that they hadn't. They would leave nearly a hundred thousand scouts stationed to keep an eye out, like they had done all over the world, but any aliens they couldn't find must have crawled deep into the Earth only to be entombed to a cave-in. So thorough and global are the signs of the massive search they committed decades to...

...an asteroid, almost certainly too massive to deflect despite being spotted so early. The centuries of peace had been appreciated despite the hardships, but this turn of events brought a wave of madness over much of the world. Production of space equipment was still in nearly full force and teams were already being sent out do as much as they could, but likely they'd only be able to chip off a fraction of it. Frantic research into alternatives was ongoing, but there were few who hadn't accepted the futility of it all, the majority were on a hedonistic spree for the next few months...

...impact, the global devastation...

...and that's how the most interesting period of Earth's history came to an end."