Ramparts/1.03

Even cheaper and faster to build, Ramparts can be built in an emergency when a defensive structure is needed to quickly prepare for an enemy assault. In comparison to other wall structures, Ramparts have half the HP but are cheaper in the sense that they do not require any stone. However, 300HP can be quickly taken care of by dedicated building demolishes (or any strong unit that scores a critical hit or death blow) - occasionally making them not last long enough to be of much use. As such, building actual wall structures are almost always the better option.

Interestingly to note, Ramparts have a larger view distance than the standard wall structures.