After a series of bloody battles, the 22nd Cavalry is once again depleted. Sent on a recruiting drive, Chesterfield meets only failure – between the reputation of their unit and Blutch's constant sabotage efforts, finding volunteers is almost impossible. Until fate brings them to a penitentiary where some very unsavoury characters are about to hang. Offered a choice, the criminals will pick the uniform over the noose, but can they be controlled?