Franz Helm
... that 16th-century artillery master Franz Helm proposed using "rocket cats" to attack castles?
... that 16th-century artillery master <b id="mwDa4"><a href="./Franz_Helm" id="mwDa8" rel="mw:WikiLink" title="Franz Helm">Franz Helm</a></b> proposed using "rocket cats" <i id="mwDbA">(pictured)</i> to attack castles?