Attack of Slovaks

I don't own the right of the book cover, all credits for cover goes to respective owner for making such a fabulous cover. In 2060 humans have an advanced technology system, they have robots and machines in almost every sector. The life was peaceful and happy. However one a space ship appears in the air begin to attack the city. The humans somehow destroyed it but then someone comes with a big space ship and declare a war against Earth. See how humanity survive this Apocalypse how they can able to defeat Slovaks who have much advance weapons and robots. How they save themselves from extinction.