How the order stopped the monster race

The order have stopped a huge number of alien lifeforms from trying to take over the world. This is the kind of thing that has made it possible for the human race to continue to be at the tip of the food chain, below the order of course. The point is that humans still think they are the kings of the world, but they have no idea how close they have come to being completely wiped out from the planet or enslaved by alien races.

There was one particular race that was extremely vicious. They looked like horrible monsters to the human eye and they hated humanity. They took an interest in the resources of planet Earth and they decided that they would take over in 1840. The order stopped their invasion with a warning that they should look into another planet for their resources. They left and never came back, but the order knows that if humans are left without their protection, these monsters would quickly arrive to eliminate humans completely.