Well-researched and -written story of Operation Jedburgh, the late World War II creation of three-man teams (French native, US or British commander, and radio operator) the year before D-Day. Shortly before the invasion a dozen or so of these teams were parachuted into German-occupied France, with the mission to train the Maquis (French resistance) in effective guerrilla tactics, radio for extra arms drops, and conduct raids, targeted by London-based leadership, designed to delay Nazi response to the invasions. Cutting rail networks, bridges, and communication lines, the Jedburgh-led resistance forces slowed German army movements towards Normandy from dozens of miles per day to a crawl, giving Allied forces time to consolidate the tenuous foothold into an unstoppable force. Later, grown to resistance forces numbering in the tens of thousands, the Jedburgh groups provided effective flank support to Patton and other Allied commanders as they swept through France, liberating huge tracts from Nazi control, and slowing German withdrawal from France, leading to the destruction of the German occupation forces. A great piece of World War II history that has never been told with such clarity.