Warner Bros. Pictures has picked up the rights to M. William Phelps' upcoming biography on American Revolutionary hero and spy Nathan Hale.

The bigscreen adaptation of Phelps' For the Sake of Liberty: America's First Spy follows the last years of his life. Variety reports the final words he spoke before being hung by the Brits was, "I only regret that I have but one life to lose for my country."

In September 1776, Hale volunteered for an espionage assignment authorized by the country's first intelligence org, formed only a month earlier under George Washington's authority. Disguising himself as a Dutch merchant, Hale sneaked onto the island of Manhattan, which had been captured by the British, to assess troop movement. His true identity was revealed, however, and he was sentenced to be executed.

No production schedule on For the Sake of Liberty has been set.