I've been trying to make fortifications more interesting, adding critical hits like the ships have, and other stuff.

One question I've come up with but don't have an answer for is; was the landward face of forts typically built as strong as the seaward face? It seems unlikely that the landward side would be subject to artillery of the size found on ships, so I could see a case for not building as strong.

Anyone got an opinion on this, or even better, genuine facts?