Elsewhere, Frederick, speaking of these two winter campaigns, says: “Winter campaigns are bad, and should always be avoided, except in cases of necessity. The best army in the world is liable to be ruined by them. I myself have made more winter campaigns than any general of this age. But there were reasons. In 1740 there were hardly above two Austrian regiments in Silesia, at the death of the Emperor Charles VI. Being determined to assert my right to that duchy, I had to try it at once, in winter, and carry the war, if possible, to the banks of the Neisse. Had I waited till spring, we must have begun the war between Crossen and Glogau. What was now to be gained by one march would then have cost us three or four campaigns. A sufficient reason, this, for campaigning in winter. If I did not succeed in the winter campaigns of 1742, a campaign which I made to deliver Moravia, then overrun by Austrians, it was because the French acted like fools, and the Saxons like traitors.”[64] Frederick, establishing his head-quarters at Chrudim, did not suppose the Austrians would think of moving upon him until the middle of June. Not till then would the grass in that cold region afford forage. But Maria Theresa was inspired by energies fully equal to those of her renowned assailant. Undismayed by the powerful coalition against her, she sent Prince Charles, her brother-in-law, early in May, at the head of an army thirty thousand strong, to advance by a secret, rapid flank march, and seize the Prussian magazines beyond the Elbe. The ever-wakeful eye of Frederick detected the movement. His beautiful encampment at Chrudim had lasted but two days. Instantly couriers were dispatched in all directions to rendezvous the Prussian troops on a vast plain in the vicinity of Chrudim. But a few hours elapsed ere every available man in the Prussian ranks was on the march. This movement rendered it necessary for Prince Charles to concentrate the Austrian army also. The field upon which these hosts were gathering for battle was an undulating prairie, almost treeless, with here and there a few hamlets of clustered peasant cottages scattered around. [Illustration: FREDERICK CONCENTRATING HIS ARMY AT CHRUDIM.]