If I remember correctly this was mentioned before. I'm posting this just to note it again.

The issue, whether a bug or an intended feature, is that embarked ranged units still suffer from close combat penalties as if they were fighting on land. Shouldn't all combat parameters of embarked units be replaced by those of transport vessels they embark?

Save File:

I've never had much difficulty in dealing with Huns on land. Embarked Huns, however, are really annoying to fight against. Hit & Run tactic of Hunnic horde is a bit immersion breaking when executed at sea. :)