The very first sinking of a ship by a submarine occurred during the U.S. Civil War, in fact!
Both the Union and Confederacy operated submarines during the war.
The very first U.S. “submarine” was used during the Revolutionary War, but it was more of a one off novelty than a move forward in industrialized war like in the Civil War.
This also happened in conjunction with the rise of ironclads, with the first ironclad vs ironclad battle also occurring in the Civil War.
I was originally going to post about the HL Hunley, which was also deployed during the Civil War. It was the first submarine to sink an enemy ship. I got distracted when I came across this submarine while making the post.
The U.S. Civil War was a time of rapid transition from Napoleonic to “modern” war.
They have a natural elephant-like walk cycle, but they do move slowly which might give the appearance of one leg at a time if you aren’t looking too closely.
No, unfortunately I’m pretty sure the comic I got this from just squeezed in some unrelated concept art onto the page. I’ve found what looks like a scan of the original sketch that doesn’t have that box. The original sketch also isn’t shaded, so I figure the comic do a little bit of adjusting for their presentation.
Yes, that’s exactly it, right down to how the feet socket into the legs. I haven’t kept up deeply with Disney produced canon. This looks like it showed up in the Rebels cartoon a few times? I know that show has used other old concept art and reintroduced it.
I thought that at first too! Then I went and actually looked at an AT-PT again. Aside from the vague shape of the vision slit area/cockpit windows, the AT-PT doesn’t really take anything from this concept. That thing is a refrigerator on legs. The concept AT-ST really looks elegant and graceful.
I know of at least a few EU works that various uglies showed up. TIEs were widespread surplus that were low cost to modify after the Empire fell, and a lot of them ended up in use by criminals and planetary defense forces.