Von Richthofen: The Legend Evaluated Page 19  
 
   This first overseas campaign by an air force might reasonably be likened to sending an army abroad with rifles, machineguns and shell-firing artillery less than eleven years after the invention of gunpowder; or a fleet of destroyers and cruisers to sea as short a time after the launching of the earliest sailing vessel.
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   [1] Hostile Aircraft
   [2] Le Prieur, electrically operated, five attached to the wing struts on either side.