>>96277192
It's honestly quite a challenge. I feel like combining land and sea might need a really specific conflict or battle, ideally with ships providing fire, but also landing crafts and maybe multiple small islands or suchlike?

I seem to recall situations where there was a ship supporting landing craft, and the marines that landed need to get up a hill and take out a shore battery, so that more ships and troops can be brought up. It was some age of sail battle, might have been northern wars or something.