Answer: What In The World Happened Here? CLI: (151)

This is perhaps the best spy trick of all time. Eli Cohen (after several false starts) began spying for Israel in Syria. He was granted access to the Golan Heights, whereupon he suggested that the soldiers in bunkers manning the armaments would be more comfortable and productive if they were sheltered by trees. Eli suggested quick-growing non-native Eucalyptus, which led to the infamous Bomb The Foreign Eucalyptus Trees. There is some irony here, as "Eucalyptus" (with respect to the sexual parts of the genus) means "Well Hidden".
Verum audaces non gerunt indusia alba. - Ipsi dixit MCMLXXII