The invasion of 1792 roused a crouching lion; and the French, after their easy and victorious defence, went over to the attack. Whilst the invaders were standing still, too weak to advance and too proud to withdraw, the conquest of Europe began. The king of Sardinia, as the father-in-law of the Comte d'Artois, had thrown himself into the counter-revolutionary policy, and the scheme for attacking Lyons. Of all European monarchs, since the murder of Gustavus, he was the most hostile. An army under Montesquieu occupied Savoy and Nice without resistance, and the people readily adopted the new system. A week later Custine seized the left bank of the Rhine, where diminutive secular and ecclesiastical territories, without cohesion, were an easy prey. The Declaration of Rights, said Gouverneur Morris, proved quite as effectual as the trumpets of Joshua. Mentz fell, October 21, and Custine occupied Frankfort and replenished his military chest. This excursion into the middle of the Empire was not authorised by State policy. The idea was already taking shape that the safety of France required the defensible and historic, or, as they unscientifically called it, the natural frontier of the Rhine, and that the grand conflict with Austria should be transferred to Italy. Germany was a nation of armed men, and was best let alone. In Italy, the Austrians would have only their own resources for war. Their most vulnerable point was the outlying principality of Belgium, so distant from Vienna and so near to Paris. Dumouriez was now at liberty to deliver the stroke by which he had hoped to stop the invasion, as Scipio drove Hannibal from Italy by landing in Africa. By carrying the war in that direction he would occupy the Imperialists, and would not excite the resentment of Prussia. The country had not long been pacified, and it presented the unusual feature that Conservatives and Liberals alike were patriotic and rebellious. As a place where disaffection would assist war, it was there that the process of European revolution would properly begin. On October 19 Dumouriez assumed the command of 70,000 men, in the region he had held before his flank march to the Argonne. One of his lieutenants was the Peruvian adventurer Miranda, whose mission it was to apply the movement in Europe to the rescue of Spanish America. The other was known as Prince Egalite, senior, whose wonderful future was already foreseen both by Dumouriez and Danton.