The earlier, medieval condottieri developed the "art of war" (military strategy and tactics) into military science more than any of their historical military predecessors—fighting indirectly, not directly—thus, only reluctantly endangering themselves and their enlisted men, avoiding battle when possible, also avoiding hard work and winter campaigns, as these all reduced the total number of trained soldiers available, and were detrimental to their political and economic interest. Niccolò Machiavelli even said that condottieri fought each other in grandiose, but often pointless and near-bloodless battles. However, later in the Renaissance the condottieri line of battle still deployed the grand armoured knight and medieval weapons and tactics after most European powers had begun employing professional standing armies of pikemen and musketeers; this helped to contribute to their eventual decline and destruction.