User blog comment:GodzillaMaster/Truly Extinct?/@comment-4466838-20111118151045/@comment-3228423-20111119002109

Well I doubt all the Collectors were on the colonies when they were attacked. More than likely just a small force, just large enough to carry away the paralyzed colonists. And judging by the size of the Collector cruiser itself, there's probably several thousand Collectors aboard. Add that as well as the Husks, seeker swarms, and any vehicle they may have, that's more than enough to classify as an army.