Leaderboard

You can use Ctrl and right-click on the producing building to set the rally point on the building itself, that way the units will garrison as soon as they are created

Yeah, of course if catapults and heavy warships significantly outranged towers and forts, that would also solve the problem. If light-medium-heavy ships were an upgrade progression, IMO the heavier ships ought to also cost more, to be realistic, but have good enough stats to be worth it. The concern is that civs without heavy warships might just lose control of the sea to civs that do have heavy warships. To keep that from happening too early in the game, the upgrades could be slow and/or expensive, and the benefits only incremental rather than overwhelming. Although right now, sea dominance is backwards. Celts and Iberians - historically relatively primitive people, around 0 A.D. - have the best navies. Briton medium warships have more HP and carry more troops than triremes. Iberian fire ships are cheap and effective. The supposedly "naval" civs with heavy warships - Ptolemies, Carthaginians, Romans, and Seleucids - are actually no better than average at sea.

Range of tower and fortress is a problem. Catapults (and heavy warships) should simply outrange the towers and foreesses. Would that help you? Also, yeah, heavy warship should have higehr base attack. I was think of going the Age of Empire way and making the ships a upgrade procession: Light -> Medium -> Heavy