For my cities I usually have a pair of archers/their upgrades, an axeman/crossbowman/upgrades, and a spearman/upgrades. I usually have some kind of fast unit ready to ride out and pick off some attackers before they pillage too much. I'll usually have my border cities with more defenders. Is this defence acceptable? Any advice for it? Perhaps I should upgrade my units with "City Defender" less, go for Drill, and march them out to meet attackers? If it's a valuable resource, I'm tempted to pop fortify some units over it to protect it from pillagers - what would a good set of units be for this purpose? For hills it's easy, I usually just have a pair of archer/upgrades with Guerilla 1 + 2, but what other units should I supplelement that with, and what should I do if it's not on hills? And what resources should I make a concious effort to defend, just the tactical/military ones? Finally, the big one - Coasts. Enemy ships have always been a pain for me, dropping units right in my least defended areas, pillaging and sometimes even taking towns of mine by surprise. I'm just not sure how to place my own ships for defence... At the very least I put a ship or two down on each fishing boated tile (I HATE having my boats pillaged!) but otherwise I'm clueless. In one game I tried stacking them near my cities once, but then Alexander got his transports in around my back side. In another I tried placing them in pairs around my borders, a "Sentry" range apart so if any ships came in towards my line they would be spotted, but the defence itself proved to weak to hold off ships when Montezuma attacked me. What is the best way to hold the naval line?