Maybe when you put units on trade route sqaures (roads oceans rivers)
You atamictically stop trade routes on your square and others sirounding them. when this happened (enemy units sirounding all possible routes of trade in city parameters) you get (the home city)
a message saying trade routes are blocked and all trade from trade routes cease to exist until you destroy the blockade
You atamictically stop trade routes on your square and others sirounding them. when this happened (enemy units sirounding all possible routes of trade in city parameters) you get (the home city)
a message saying trade routes are blocked and all trade from trade routes cease to exist until you destroy the blockade
