Put some old oil and grease over the gate.
Conceal some puncture causing spike strips under the gate.
Get an electric fence battery, and hide some wires around were you stack the logs, set it to high.
Build a deep large pit, cover with twigs and leaves. Pop to local zoo and kidnap lion, put lion inside pit and conceal once more.
Don't involve the police, they'd rather hide behind speed limit signs, with a speed camera and catch those that are breaking the speed limit marginally.