Exactly. For a costal city, blockading its harbor takes at least three ships in Civ3. It's hardly worth bothering with. In the real world, enemy warships can intercept trade. Think about all the oil going from the Persian Gulf to North America and Western Europe. Now imagine if some country went on a rampage and started sinking those ships. That's why modern countries need a navy. This was not a factor in Civ3.
Since there were no fishing or other sea improvements in Civ3, protecting those was not required either - and fishing luckily is in Civ4, after all, it is a very important element for many countries. Hopefully there will also be some easier way to disturb overseas trade, making navies more needed.
Since there were no fishing or other sea improvements in Civ3, protecting those was not required either - and fishing luckily is in Civ4, after all, it is a very important element for many countries. Hopefully there will also be some easier way to disturb overseas trade, making navies more needed.
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