An Austrian army of about 50,000 men, commanded by Field Marshal Prince SCHWARTZENBURG, and the Army of Reserve under the Archduke FERDINAND, amounting to 40,000 men, were gradually occupying the most important points along the right bank of the Rhine, between Basle and Mannheim. In addition to this force, about 120,000 men were then assembling on the plains of Lombardy, upon the termination of the decisive Campaign against MURAT; which secured the deposition of the latter, and the restoration of King FERDINAND to the throne of Naples. Vigorous and energetic measures such as these on the part of Austria, clearly indicated that her Government, discarding alike the circumstance of a family alliance with NAPOLEON, and the views which had once induced it to enter into a league with him and with the Southern German States, as a security against its formidable northern neighbours, still adhered with inflexible resolution to its subsequently adopted policy of entering into, and fostering, a general European compact, having for its object the complete annihilation of the despotic sway of the ambitious Soldier Sovereign of the French. The assembling also, on the Upper Rhine, of a Bavarian Army, commanded by Prince WRÈDE, of the Contingents of Baden and Würtemberg, under the hereditary Prince of WÜRTEMBERG, and of the troops of Hesse, amounting altogether to about 80,000 men, offered a sufficient guarantee for the line of policy espoused by the Confederated States of the Rhine. * * * * * Formidable as was the attitude assumed by the Allies towards France, and imposing as was their array of Armies assembling upon her frontier; they nevertheless found their great antagonist prepared, on learning that they had determined on an irrevocable appeal to the sword, to throw away the scabbard. He assumed a bold and resolute posture of defence--armed at all points, and prepared at all hazards, either to ward off the blows of his adversaries, or to become himself the assailant. The indefatigable exertions of NAPOLEON in restoring the Empire to its former strength and grandeur were really astonishing; and never, perhaps, in the whole course of the extraordinary career of that extraordinary man, did the powerful energies of his comprehensive mind shine forth with greater brilliancy and effect, than in his truly wonderful and incredibly rapid development of the national resources of France on this momentous occasion.