Atla worldbuilding thought: In Atla steam engines and ships with metal hull exist. Guns, on the other hand, do not exist.

There was a short time window in our history in which guns were ineffective against Ironclads. In one battle they tried the solution of ramming and it worked surprisingly well. But it didn't become common practice because gun technology caught up.

But in the world of Atla, without guns, naval battles would be ramming focussed.