Earths Surrender

Three years after an extraterrestrial life form invaded the earth, Christina and her group of survivors think they are the last living humans among the alien Crawlers until they run into another group. Is this group dangerous? Will this group help? The only similarities between the two groups is to get rid of the alien life forms taking out every human on site. In a war between Humans and Crawler for the prize, Earth. Will the last remaining humans surrender the Earth over to the Crawlers?