Sure, let's keep it simple. Build a sturdy wall or ditch, add a few motion‑sensors that trigger loud alarms or a spray of water, and make sure the gates have a quick lock that can be operated manually. With a clear line of sight and a few key sensors, you can watch a lot of ground with just a handful of devices. Keep it low‑profile, easy to repair, and you’ve got a system that’s tough and reliable.