I recently discovered new (to me) research showing the very substantial nature of timber bridges in the post-Roman era. Stamford Bridge probably looked more like this than the fanciful one in the 1066 book!
Once downloaded, the sheets can be printed as often as you like, which means you can build up large armies very cheaply. You will need scissors, a craft knife, glue, appropriate paper and some stiffer card for bases, all of which are described in the how-to section.
The figures are laid out on A4 format, which will print onto US legal sized paper, or will fit US letter size printed at 93%. You can, of course, print the figures in any scale you choose, making them uniquely flexible in this respect.
You will need to make a stiff 40mm wide card base for each stand. It should be 30mm deep for three rank infantry and all cavalry, and 20mm deep for two rank infantry and skirmishers.