El ocaso de los tercios. The background, course and consequences of the Battle of Rocroi in 1643 are presented, in which the previously successful Spanish troops and their tercios suffered a crushing defeat at the hands of the French. However, not only the historical events surrounding the battle are discussed, but also the equipment, tactics and composition of the armies in the Battle of Rocroi. Spanish text, many bw illustrations in the text, some colour uniform plates, bw maps.