You don't get the battle screen when you attack a stack consisting entirely of non-combat (0 attack strength) units. They just die. A coracle is one such unit. They would not be able to damage your units, showing the battle would be pointless.
If you find someone's borders extending across the sea into your land, you can still settle inside his borders to reclaim it. You CAN settle inside another nation's borders, the only restriction is that you can't settle inside another city's influence. As a city grows, it will claim any territory for itself and for its nation that is not yet claimed by another city. It will never take land away from another city, however.
The rules for forts may not be obvious either - you can build a fort anywhere in your own territory (like any improvement) but also on any unclaimed land anywhere in the world as long as you are able to see that land at the time you start building. So if you can't get a settler out to build a city to claim some outlying parts of your continent, get any unit at all out there and build a fort. It won't reclaim anything from another nation, but it will help you consolidate your land until you can get cities everywhere.
If you find someone's borders extending across the sea into your land, you can still settle inside his borders to reclaim it. You CAN settle inside another nation's borders, the only restriction is that you can't settle inside another city's influence. As a city grows, it will claim any territory for itself and for its nation that is not yet claimed by another city. It will never take land away from another city, however.
The rules for forts may not be obvious either - you can build a fort anywhere in your own territory (like any improvement) but also on any unclaimed land anywhere in the world as long as you are able to see that land at the time you start building. So if you can't get a settler out to build a city to claim some outlying parts of your continent, get any unit at all out there and build a fort. It won't reclaim anything from another nation, but it will help you consolidate your land until you can get cities everywhere.
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