As to the actual conduct of their expeditions, Nicias has not a little to his credit, for he conquered his enemies in many battles, and barely missed taking Syracuse, and not all his failures were due to himself, but they might be ascribed to his disease and to the jealousy of his fellow-citizens at home; but Crassus made so many blunders that he gave fortune no chance to favour him. We may not therefore wonder that his imbecility succumbed to the power of the Parthians, but rather that it prevailed over the usual good fortune of the Romans.