[ 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

It's been 100 years, we are ready. The human race was challenged to a fight with an alien race and given 100 years to prepare. They proved to us we were n't ready back then. Half of our missiles exploded in their silos. Of those that launched, less than 1 in 100 hit something. That something did n't even get scratched. 
 
 The aliens spoke to everyone, all over the world, in whatever the local dialect was. We had 100 years to get better at defending ourselves. They would be back and they would take over then. 
 
 Every government suddenly had something in common with every other government. Patent offices were raided. Research centers were given nearly unlimited funds. Even the craziest ideas were dusted off and explored. Technology made leaps and bounds. One hundred years ago, nobody thought that what we discovered was even possible. 
 
 We now have Anti-matter Bombs, Ion Cannons, and space ships, lots and lots of space ships. Nearly 80 % of able bodied humans - no longer just Americans or just Russians, or even just Arabs, `` Humans'' - male and female alike have been trained up in using these new weapons and devices. We were as ready as 100 years could make us. 
 
 The entire previous week was given over to celebrating our readiness. 
 
 Then the day we prepared for dawned. Every weapon was charged and manned. Every missile was prepared to launch. Clocks everywhere counted down to the appointed meeting. 
 
 As the final second ticked away, a bright flash appeared at the expected point in local space. 
 
 A voice immediately boomed out `` HOLD YOUR FIRE... PLEASE!''. 
 
 Hands twitched on the firing buttons, fingers pulled back on triggers but left the guns unused. Every hand everywhere stopped. Then the clocks ticked again, and again. Time was continuing but the fight we had prepared for had not started. 
 
 `` WE COME IN PEACE'' 
 
 `` THIS TIME. WE ARE NOT HERE TO DESTROY YOU!'' 
 
 `` It seems that humans beat us last time and we felt it necessary to let you know.'' 
 
 As before, every human was hearing this in their preferred language. 
 
 The voice continued `` A virus was transported back to our home world 100 years ago.'' 
 
 `` It infected the entire planet, along with all of our colonies and stations before we even knew about it.'' 
 
 `` Once the virus made itself known, it was too late. The death toll was in the trillions. One hundred years later we are still cleaning up the dead and recovering the land and buildings where they died. If it were n't for this ship and the half a dozen others that were found still useable, we would n't have been able to even show up for this meeting.'' 
 
 A long pause ensued, weapons were lowered, missiles stood down. 
 
 The voice began again; `` Less than 1 in 100000 of our people survived. Half of them died when the virus made a second attack.'' 
 
 `` It has taken us the past 90 years just to get back into space. The only reason that we managed even that much is because of the records of previous advancements.'' 
 
 `` This ship will go now, if you wish to finish us off, we will not fight back. We even freely give you our location in the galactic arm.'' 
 
 This was followed by a star map downloaded into our computers with one star highlighted. 
 
 Another long pause was finally broken by a human voice; `` Is there anything we can do to help?'' 

