Example of a four-wheeled ballista.
<p>Print shows two soldiers with a horse-drawn ballista. The device, mounted on a wagon, is manipulated like a crossbow, shooting large arrows at enemy fortifications. The horses are well covered with armor. Taken from the collection <i>Notitia utraque cum orientis tum occidentis ultra Arcadii Honoriique Caesarum tempora</i> (1552) edited by Sigismund Gelenius (1477–1554). This part is from the <i>De Rebus Bellicis</i>, which contains many illustrations of weapons and engines of war.
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print: engraving
Unknown author<span style="display: none;">Unknown author</span>
<a href="//commons.wikimedia.org/w/index.php?title=1552&amp;action=edit&amp;redlink=1" class="new" title="1552 (page does not exist)">1552</a>
Library of Congress, Prints &amp; Photographs Division, LC-USZ62-110291 (b&amp;w film copy neg.), <a rel="nofollow" class="external text" href="http://memory.loc.gov/master/pnp/cph/3c10000/3c10000/3c10200/3c10291u.tif">uncompressed archival TIFF version (12 MiB)</a>, color level (adjust contrast), cropped, and converted to JPEG (quality level 88) with the GIMP 2.6.1