Follow-up Comment #5, bug #14264 (project freeciv):

Since ancient times there has been tunneling detection systems, which is
quite complex ; how about in an imaginary world (don't know if it ever
happened historically), there would be a simple rope system that upon wall
bricks at a level fall down that some kind of detection system is triggered,
be it cord & belt or caged trained pigeons (the cage open then pigeon fly back
to city). With bell-like system, it could require any unit (thinking of those
without upkeep, spy with vision 2 being especially interesting) to be
stationed every so wall length. Or worse case use any unit (with vision) to
patrol next to the wall looking through tiny hole in it to look at incoming

Even in modern warfare there is Dragon's teeth and Czech hedgehog. I don't
think border fortifications (as opposed to a base) are to be neglected.


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