Mardonius, it will be recollected, was the commander-in-chief of the forces of Xerxes, and thus, next to Xerxes himself, he was the officer highest in rank of all those who attended the expedition. He was, in fact, a sort of prime minister, on whom the responsibility for almost all the measures for the government and conduct of the expedition had been thrown. Men in such positions, while they may expect the highest rewards and honors from their sovereign in case of success, have always reason to apprehend the worst of consequences to themselves in case of failure. The night after the battle of Salamis, accordingly, Mardonius was in great fear. He did not distrust the future success of the expedition if it were allowed to go on; but, knowing the character of such despots as those who ruled great nations in that age of the world, he was well aware that he might reasonably expect, at any moment, the appearance of officers sent from Xerxes to cut off his head. His anxiety was increased by observing that Xerxes seemed very much depressed, and very restless and uneasy, after the battle, as if he were revolving in his mind some extraordinary design. He presently thought that he perceived indications that the king was planning a retreat. Mardonius, after much hesitation, concluded to speak to him, and endeavor to dispel his anxieties and fears, and lead him to take a more favorable view of the prospects of the expedition. He accordingly accosted him on the subject somewhat as follows: "It is true," said he, "that we were not as successful in the combat yesterday as we desired to be; but this reverse, as well as all the preceding disasters that we have met with, is, after all, of comparatively little moment. Your majesty has gone steadily on, accomplishing most triumphantly all the substantial objects aimed at in undertaking the expedition. Your troops have advanced successfully by land against all opposition. With them you have traversed Thrace, Macedon, and Thessaly. You have fought your way, against the most desperate resistance, through the Pass of Thermopylae. You have overrun all Northern Greece. You have burned Athens. Thus, far from there being any uncertainty or doubt in respect to the success of the expedition, we see that all the great objects which you proposed by it are already accomplished. The fleet, it is true, has now suffered extensive damage; but we must remember that it is upon the army, not upon the fleet, that our hopes and expectations mainly depend. The army is safe; and it can not be possible that the Greeks can hereafter bring any force into the field by which it can be seriously endangered."