[ WP ] Aliens come to Earth in hoping to wipe us out and take over the planet , but are honorable and gives us a fighting chance . They announce they will return in 100 years so as to give Earth a chance to prepare and defend itself . Neither side expected what the other would bring to war

If there ’ s one thing we humans do, it ’ s fight dirty. 
 
 The Geneva Conventions? Back then, they didn ’ t apply to aliens, especially _them_. They came in and declared war on humanity itself, and all bets were off. This was a matter of life and death, and if we didn ’ t kill them first, we as a species were over. 
 
 Nations banded together, the worst of enemies forced to play nice by the threat of annihilation. 
 
 Well, except for one. North Korea never knew when to quit, really. China got done with them real fast. 
 
 The world kicked into high gear, every single one of us going into war mode. 
 
 Me? Like any hotblooded human, I enlisted. A girl fresh out of school, I was. 
 
 Now, we had a hundred years to ourselves, and with how technological advancement was even back then, we thought we had a pretty good deal. I got my hands on one of the first railguns over in Germany, and that thing was a pretty little beast. The things that baby could _do_! 
 
 Germany was good to me. Food ’ s great, and the men and women there are rather nice, I can tell you that. 
 
 Red light district? Aren ’ t you a bit young to be asking that? 
 
 So, ten years in, and we ’ re actually off Earth. Luna had been up and running for a while, then, but the only ones up there were eggheads, shipbuilders, and miners, among those of us unlucky enough to be deployed on that rock. 
 
 Yep, I was stationed there for a while. Got to see the shiny new ships as they were built, so it wasn ’ t all _that_ boring. 
 
 Five years later, and Mars became our first colony, and that ’ s where we found life on another planet that didn ’ t want to kill us. Tasty, too. You know the worms and stuff at Mick ’ s? Martian. Now, see, he gets ‘ em straight off the red planet itself, I can tell. 
 
 So, twenty-seven years in, I was ‘ bout ready to retire, go back to live with my husband and kids, and then the eggheads made a breakthrough in that FTL stuff. First thing we do is try and find the bad guys ’ base. 
 
 I retired before it mattered. I know, I ’ m old. Still put in a few more years of service anyway. 
 
 Thirty-three years in, we found some old signals coming from a bit further up our arm of the galaxy, a couple hundred parsecs away, really. 
 
 Now, hold on, remember they gave us a hundred years? We took our sweet time building up our navy and such. 
 
 And, not long before y ’ all were born, we nuked their butts. 
 
 Hey, they were stupid enough to think we ’ d follow the rules, why would they surrender? 
 
 And that ’ s the thing, they never saw us coming. Almost felt sorry for ‘ em. 
 
 There ’ s got to be a video of one floating around somewhere. No, they ’ re not actually _glassed_, that ’ d have been overkill. 
 
 A lot of us cheered, really. But that wasn ’ t it. Navy had to fight for weeks before we “ officially ” won. 
 
 And that ’ s how we committed our biggest genocide to date.
