James Garner stars as WWII hero Major William Darby in this characteristically gusty William Wellman combat film. Darby organizes a highly-trained group of rangers, to be deployed in behind-the-lines activities in Italy and Northern Africa. The first portion of the film details the training, with time out for a few comic and romantic interludes; the second part shows Darby's Rangers in full, ferocious action. In addition to Garner, Warner Bros. used Darby's Rangers to spotlight another of its TV stars, Edd "Kookie" Byrnes; Bill Wellman Jr. also shows up in the supporting role of Eli Clatworthy. The film was adapted from the book by Major James Altieri.