Colonization
The soldiers watched from the shadows, as the Xenos quickly started running around their land, turning on machines, working on things. It was like they had awoken from some slumber. Many of them started working on a large wall outside, while the ones holding the large, black rectangles stood guard. The soldiers took this information, and digested it, starting to raid at night, and sometimes, at day, to keep the Xenos surprised. Most of the raids were of little or no point, with almost all of them ending in no blood shed on either side. However, one raid on the construction site itself proved very valuable. The Xenos were lazy, and not expecting a brave raid on such a central point of their operations. The unarmed workers proved almost incapable of defending themselves, and the brave soldiers killed 20 of them before being forced to retreat by the armed guards, losing 5 of their own. The next night, 100 of the soldiers gathered outside the now-finished wall, and stopped. Even with the loyalty to the queens bred into them, even with them barely even knowing what fear is, they stopped. Some would say it was a tactical move, that they did not attack because it would be a waste of lives. But in the end, it was fear. Fear affects everything, from the biggest giant, to the smallest microbe. On that day, facing that high wall, brimming with gun turrets and, to the Aliens, the embodiment of death, the Fearless felt fear.
At the same time, workers burrowed under their feet, digging small tunnels they could collapse at will. They could not dig directly under the wall, due to it's foundations, but they dug all around it, providing a very good incentive to not expand any further. The queens, meanwhile, got to work laying eggs. By the end of the next couple of days, 2500 Aliens had hatched, with 500 of them being soldiers, and all the eggs were replaced by new ones.
100 Queens (Gigantic, underground egg layers, dozens of feet long. They can't defend themselves, but they lay eggs quickly, and they do not take long to hatch. All of the queens working together can try to create a new type of Alien, but a failure could result in the death of a queen.)
2500 Eggs (1/4 eggs hatches into a soldier, and 1/2000 hatches into a queen.)
12000 Workers (Slightly smaller then a human, workers are skilled builders, and are good at using what limited technology they have. They are still dangerous in combat, but are cowardly and usually run away.)
5465 Soldiers (Much bigger then a human, and very fast, soldiers are bred to kill, with hardened plates and razor-sharp claws. However, they are not very good at normal work.)