Dream: Outpost

I'm viewing an Outpost in a wilderness. So I'm sort of there, but I'm really just watching as if separate from the place. Some dangerous, evil creatures have invaded. We don't see them, but we know they're there because they build structures on the land -- huge, skeletal pieces. Someone realized that the creatures could be defeated if the structures are toppled, and so that's what the men are doing. It starts slow with a girder coming down every so often. But then a huge structure is detonated and collapses, which turns the tide. The last structures to be removed are wooden scaffolding and shutters, like saloon doors, that are attached to the concrete Outpost building itself. These are easily removed, and all is back to normal.