…a wheeled body shield that affords immunity from rifle bullets and shrapnel when advancing upon fortified positions. The body of this is constructed of tempered-steel plates, the front so rounded and tempered that bullets strike the surface at an angle and glance off without doing harm…
When you think of the bomb-cratered, mud-covered battlefields of World War I, it’s no surprise these never rolled farther than the drawing board. Between artillery fire and terrain, even early tanks were of limited use. These would have been caskets.
On second thought, maybe after some modifications they could have been enlisted in the fight against Ming? The technology looks similar.