About Burning Pitch Moat :
Burning pitch moats, while not common, were sometimes used to repel attacks. Although almost certain to repel any close range attack, the danger was also that one could not put the fire out. Copious amounts of sand to starve the fire of air was about the only way to control the burn once it had been started.
The following base innovation(s) are required prior to discovery of Burning Pitch Moat:
(Burning Pitch Moat isn't a required technology for any innovations)
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