[RightWhale]

Common law also says trespassers may be shot and their heads placed on pikes by the front entrance.

[Notwithstanding]

Check out Wisconsin's common law for trespassing (cited in Wisconsin court opinions in which trespass of necessity was at issue) and I dont't think you will find your red-herring heads-on-pikes provision.

[Iron Eagle]

Common law also says trespassers may be shot and their heads placed on pikes by the front entrance.

I must have been absent that semester. Actually, the common law does not permit the use of deadly force in defence of real property (i.e. real estate).