Is there any point to leaving garrisons in the harbor-only locations? When I'm playing as the Union, I make it a point to keep troop garrisons in most of the strategic value cities in Kansas, Missouri, and parts of Iowa and Illinois. But there are harbor only sites that the AI seems to zero in on for resupply. The harbor sites don't seem to offer any protection for land units, but they are supply sources.
Was curious to know how people treated them. Thanks.