American fighting men had never seen the likes of it before The great battle of the Meuse-Argonne was the costliest conflict in American history, with 26,000 men killed and tens of thousands wounded. Involving 1.2 million American troops over 47 days, it ended on November 11--what we now know as Armistice Day--and brought an end to World War I, but at a great price. Distinguished historian Robert Ferrell now looks back at this monumental struggle...