Ditches

I was just re watching an old episode of Time Team and I had a sudden realization. (Team Time, great show about archeology BTW) We can't make ditches yet, while I'm more familiar with British/UK medieval history than Slavic, ditches are a huge part of settlement features from pre history up until the medieval. While in pre history they were less defensive and more for enclosure for livestock, in the medieval they were used in a defensive roll around settlements and manor houses. It would be an easy tier one defensive measure, and really should only take labour to make. Perhaps make them take a while to build IDK. Unless of course they weren't used in the region and time frame the game is set in, then disregard and carry on. I'd just love to see this game be as historical accurate in as many was as it can.