Abstract: A security fence system provides one or more lengths of fence and/or one or more gates, at least one of which includes at least one generally horizontal cable, and preferably earth anchors that secure the at least one cable to the ground. The security fence and/or gates preferably include one or more of the following features: little or no concrete; strong and damage-resistant fence panels that allow authorities to see fairly well through the fence; resistance to prying or otherwise tearing the fence panel away from the posts; resistance to vehicles ramming the fence; or manual and/or automatic gates that are resistant to vehicles ramming the gate(s) and that cooperate with the cable system of the preferred fence. Cables approaching the gate, from the fence, may meet and be secured to each other at a location along the gate. Alternatively, automatically-locking gates may include a hook and loop system that engages only when a ramming vehicle pushes and/or bends the gate.