In his military career the duke displayed some of the qualities most characteristic of his countrymen. But they were those qualities which belong to a riper period of life. He showed little of that romantic and adventurous spirit of the Spanish cavalier, which seemed to court peril for its own sake, and would hazard all on a single cast. Caution was his prominent trait, in which he was a match for any graybeard in the army;--a caution carried to such a length as sometimes to put a curb on the enterprising spirit of the emperor. Men were amazed to see so old a head on so young shoulders. Yet this caution was attended by a courage which dangers could not daunt, and by a constancy which toil, however severe, could not tire. He preferred the surest, even though the slowest, means to attain his object. He was not ambitious of effect; he never sought to startle by a brilliant _coup-de-main_. He would not have compromised a single chance in his own favor by appealing to the issue of a battle. He looked steadily to the end, and he moved surely towards it by a system of operations planned with the nicest forecast. The result of these operations was almost always success. Few great commanders have been more uniformly successful in their campaigns. Yet it was rare that these campaigns were marked by what is so dazzling to the imagination of the young aspirant for glory,--a great and decisive victory.--Such were some of the more obvious traits in the military character of the chief to whom Philip, at this crisis, confided the post of viceroy of Naples.[143]