Ceramics tend not to handle being dropped well, and I'm guessing that these aren't particularly bright (although it would hardly be off for them to have the skill sets of the soldiers they represent, in which case they are much scarier). Pit traps, luring them to cliffs and shoving them off, and other ways of arranging a drop onto a reasonably solid surface are likely to work well.

Incidentally, second story or above windows above a paved street fit this category just fine, and 1930s China had no shortage of them.