THREE:221 By the 10th of December, within a fortnight of the time that the king received the tidings of the death of the emperor, he had collected such a force on the frontiers of Silesia that there could be no question that the invasion of that province was intended. As not the slightest preparation had been made on the part of Austria to meet such an event, the king could with perfect ease overrun the province and seize all its fortresses. But Austria was, in territory, resources, and military power, vastly stronger than Prussia. It was therefore scarcely possible that Frederick could hold the province, after he had seized it, unless he could encourage others to dispute the succession of Maria Theresa, and thus involve Europe in a general war. Frederick, having made all his arrangements for prompt and vigorous action, sent to Maria Theresa a message which could be regarded only as an insult:Frederick, having carefully scanned the Austrian lines for an instant or two, gave the signal, and all his batteries opened their thunders. Under cover of that storm of iron, several thousand of the cavalry, led by the veteran General Bredow, deployed from behind some eminences, and first at a gentle trot, and then upon the most impetuous run, with flashing sabres, hurled themselves upon the left wing of the Austrian lines. The ground was dry and sandy, and a prodigious cloud of dust enveloped them. For a moment the tornado, vital with human energies, swept on, apparently unobstructed. The first line of the Austrian horse was met, crushed, annihilated. But the second stood as the rock breasts the waves, horse against horse, rider against rider, sabre against sabre. Nothing met the eye but one vast eddying whirlpool of dust, as if writhing in volcanic energies, while here and there the flash of fire and the gleam of steel flickered madly through it.