All of the illustrations here come from early explosives and warfare manuals copied and re-copied with alterations between the 16th and 17th centuries. The immediate originator of the idea behind these cat and bird bombs was Franz Helm of Cologne, an artillery master in the service of various German princes who likely served in campaigns against Turkish forces during the mid-16th century. He wrote a treatise on siege warfare (Buch von den probierten Künsten) and artillery that circulated widely in manuscript, but was not published in print until 1625.
Apparently these were the instructions:
“Create a small sack like a fire-arrow … bind the sack to the back of the cat, ignite it…and thereafter let the cat go, so it runs to the nearest castle or town, and out of fear it thinks to hide itself where it ends up in barn hay or straw it will be ignited.”
Of course, this isn't just Spark work...