Battling Grogan and his men knew there was something strange, menacing about the crest of Ming Kung Chan hill. Nothing visible was there, yet every man on that Dragon flight heard whispered warnings of impending doom from the cliff below. And when Grogan received word that no night patrols should go out from his squadron, he knew that somewhere on that sinister cliff lurked a weapon that could strike at the Dragons only in the inky darkness of night.

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