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In this Tuesday, March 4, 2014 photo is an illustration from a manual by 16th century artillery master Franz Helm at the University of Pennsylvania library in Philadelphia. The manual on artillery and siege warfare depicts a cat and dove strapped with bombs to “set fire to a castle or city which you can’t get at otherwise.” (AP Photo/Matt Rourke)

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cfbdb425287ea6094d0f6a706700623b.jpg

In this Tuesday, March 4, 2014 photo is an illustration from a manual by 16th century artillery master Franz Helm at the University of Pennsylvania library in Philadelphia. The manual on artillery and siege warfare depicts a cat and dove strapped with bombs to “set fire to a castle or city which you can’t get at otherwise.” (AP Photo/Matt Rourke)

e55f94f7287da6094d0f6a70670054ba.jpg

e55f94f7287da6094d0f6a70670054ba.jpg

In this Tuesday, March 4, 2014 photo is an illustration from a manual by 16th century artillery master Franz Helm at the University of Pennsylvania library in Philadelphia. The manual on artillery and siege warfare depicts a cat and dove strapped with bombs to “set fire to a castle or city which you can’t get at otherwise.” (AP Photo/Matt Rourke)