http://worldnews.nbcnews.com/_news/2012/12/17/15970511-unbreakable-wwii-carrier-pigeon-code-cracked-says-canadian-enthusiast?lite=obnetwork

“LONDON — A note written in code that was found on the skeleton of a carrier pigeon dating from World War II has been cracked, according to a Canadian history enthusiast.

“Originally discovered in November, the message was enclosed in a red canister attached to the leg bone of the carrier pigeon. David Martin found the pigeon in the chimney of his home in Surrey, England.”

“He believes that the message was sent one afternoon in 1944, not long after the Allied landing at Normandy. It was written by an officer who was dropped behind enemy lines, confirming an earlier lunch-time note he sent giving the map coordinates of the Germans’ guns and tanks. It also confirmed that several units of American and British troops had finally met up.”