During the two months over which these contests between Masséna and his enemies were spread, the affairs of the French in Italy were growing daily more desperate. After the victory of Magnano the Austrians were joined, on the 24th of April, by twenty thousand Russians under Marshal Suwarrow, who became general-in-chief of the allied armies. On the 26th Schérer turned over his command to Moreau; but, although the latter was an officer of very great capacity, the change was too late to avoid all the impending disasters. On the 27th the passage of the Adda was forced by the allies, and on the 29th they entered Milan; the French retiring upon the Ticino, breaking down the bridges over the Po, and taking steps to secure their communications with Genoa. Pausing but a moment, they again retreated in two columns upon Turin and Alessandria; Moreau drawing together near the latter place the bulk of his force, about twenty thousand men, and sending pressing invitations to Macdonald to hasten the northward march of the army of Naples. The new positions were taken the 7th of May, and it was not till the 5th that the Austro-Russians, delayed by the destruction of the bridges, could cross the Po. But the insurrection of the country in all directions was showing how little the submission of the people and the establishment of new republics were accompanied by any hearty fidelity to the French cause; and on the 18th, leaving a garrison in Alessandria, Moreau retreated upon the Apennines. On the 6th of June his troops were distributed among the more important points on the crest of the range, from Pontremoli, above Spezia, to Loano, and all his convoys had safely crossed the mountains to the latter point. It was at this moment that he had an interview with Admiral Bruix, whose fleet had anchored in Vado Bay two days before. [4]
While events were thus passing in Upper Italy, Macdonald, in obedience to his orders, evacuated Naples on the 7th of May, at the moment when Moreau was taking his position on the Apennines and Bonaparte making his last fruitless assault upon Acre. Leaving garrisons at the principal strong places of the kingdom, he hurried north, and on the 25th entered Florence, where, though his junction with Moreau was far from being effected, he was for the first time in sure communication with him by courier. There were two routes that Macdonald might take,—either by the sea-shore, which was impracticable for artillery, or else, crossing the Apennines, he would find a better road in the plain south of the Po, through Modena and Parma, and by it might join the army of Italy under the walls of Tortona. The latter course was chosen, and after a delay too much prolonged the army of Naples set out on the 9th of June. All went well with it until the 17th, when, having passed Modena and Parma, routing the allied detachments which he encountered, Macdonald reached the Trebia. Here, however, he was met by Suwarrow, and after three days' desperate fighting was forced to retreat by the road he came, to his old positions on the other side of the mountains. On the same day the citadel of Turin capitulated to the allies. After pursuing Macdonald some distance, Suwarrow turned back to meet Moreau, and compelled him also to retire to his former posts. This disastrous attempt at a junction within the enemies' lines cost the French fifteen thousand men. It now became necessary for the army of Naples to get to Genoa at all costs by the Corniche road, and this it was able to do through the inactivity of the enemy,—due, so Jomini says, not to Suwarrow, but to the orders from Vienna. By the middle of July both armies were united under Moreau. As a result of the necessary abandonment of Naples by the French troops, the country fell at once into the power of the armed peasantry, except the garrisons left in a few strong places; and these, by the help of the British navy, were also reduced by the 1st of August.
This striking practical illustration of the justness of Bonaparte's views, concerning the danger incurred by the French in Upper Italy through attempting to occupy Naples, was followed by further disasters. On the 21st of July the citadel of Alessandria capitulated; and this loss was followed on the 30th by that of Mantua, which had caused Bonaparte so much delay and trouble in 1796. The latter success was somewhat dearly bought, inasmuch as the emperor of Germany had positively forbidden Suwarrow to make any further advance before Mantua fell. [5] Opportunity was thus given for the junction of Moreau and Macdonald, and for the reorganization of the latter's army, which the affairs of the Trebia and the subsequent precipitate retreat had left in a state of prostration and incoherence, from which it did not recover for a month. The delay would have been still more favorable to the French had Mantua resisted to the last moment; but it capitulated at a time when it could still have held out for several days, and Suwarrow was thus enabled to bring up the besieging corps to his support, unknown to the enemy.
Meanwhile Moreau had been relieved by Joubert, one of the most brilliant of the young generals who had fought under Bonaparte in Italy. The newcomer, reaching his headquarters on the 2d of August, at once determined upon the offensive, moved thereto by the wish to relieve Mantua, and also by the difficulty of feeding his army in the sterile mountains now that ruin had befallen the coastwise traffic of Genoa, by which supplies had before been maintained. [6] On the 10th of August the French advanced. On the 14th they were in position at Novi; and there Joubert saw, but too late, that Suwarrow's army was far larger than he had expected, and that the rumor of Mantua's fall, which he had refused to credit, must be true. He intended to retreat; but the Russian marshal attacked the next morning, and after a fierce struggle, which the strength of their position enabled the French to prolong till night, they were driven from the field with heavy loss, four general officers and thirty-seven guns being captured. Joubert was killed early in the day; and Moreau, who had remained to aid him until familiar with all the details of his command, again took the temporary direction of the army by the agreement of the other generals. Immediately after the battle Suwarrow sent into the late Papal States a division which, co-operating with the Neapolitan royalists and the British navy, forced the French to evacuate the new Roman republic on the 27th of September, 1799.
At this moment of success new dispositions were taken by the allied governments, apparently through the initiative of Austria; which wished, by removing Suwarrow, to keep entire control of Italy in her own hands. This change of plan, made at so critical a moment, stopped the hitherto triumphant progress; and, by allowing time for Bonaparte to arrive and to act, turned victory into defeat. By it Suwarrow was to march across the Alps into Switzerland, and there take charge of the campaign against Masséna, having under him an army composed mainly of Russians. The Archduke Charles, now commanding in Switzerland, was to depart with the greater part of the Austrian contingent to the lower Rhine, where he would by his operations support the invasion of Holland then about to begin.
On the 13th of August,—the same day that Bruix entered Brest, carrying with him the Spanish fleet, and two days before the battle of Novi,—the expedition against Holland, composed of seventeen thousand Russians and thirty thousand British troops, sailed from England. Delayed first by light winds and then by heavy weather, the landing was not made till the 27th of the month. On the 31st the Archduke, taking with him thirty-six thousand Austrians, started for the lower Rhine, leaving General Hotze and the Russian Korsakoff to make head against Masséna until the arrival of Suwarrow. The latter, on the 11th of September, immediately after the surrender of Tortona, began his northward march.
At the moment the Archduke assumed his new command, the French on the lower Rhine, crossing at Mannheim, invested and bombarded Philipsburg; and their operations seemed so far serious as to draw him and a large part of his force in the same direction. This greatly diminished one of the difficulties confronting Masséna in the offensive movement he then had in contemplation. Hearing at the same time that Suwarrow had started from Italy, he made his principal attack from his left upon the Russians before Zurich on the 25th of September, the right wing of his long line advancing in concert against the Austrian position east of Lake Zurich upon its inlet, the Linth. Each effort was completely successful, and decisive; the enemy being in both directions driven back, and forced to recross the streams above and below the lake. Suwarrow, after a very painful march and hard fighting, reached his first appointed rendezvous at Mutten two days after the battle of Zurich had been lost; and the corps that were to have met him there, fearing their retreat would be cut off, had not awaited his arrival. The old marshal with great difficulty fought his way through the mountains to Ilanz, where at length he assembled his exhausted and shattered forces on the 9th of October, the day on which Bonaparte landed at Fréjus on his return from Egypt. By that time Switzerland was entirely cleared of Russians and Austrians. The river Rhine, both above and below Lake Constance, marked the dividing line between the belligerents.