Partly from weakness, partly to create a diversion, the Directoire was now drifting into a new war. In February, owing to French intrigues, a riot took place at Rome, which resulted in a republic being proclaimed and the Pope being driven from the city. Further north the same process was repeated. French troops occupied Bern, and under their influence an Helvetic republic came into existence. Meanwhile, the war with England continued with increased vigour; a great stroke was aimed at England's colonial empire of the East, Bonaparte sailing from Toulon for Egypt on the 19th of May. On the 12th of June he seized Malta; on the 21st of July he routed the Mamelukes in the battle of the Pyramids; and on the 1st of August his fleet was destroyed at its anchorage, near the mouth {254} of the Nile, by Admiral Nelson. The best army and the best general of the Directoire were cut off in Egypt. Meanwhile Nelson, returning to Italy to refit his ships, decided the court of Naples to join in the war against France, and determined the march of Ferdinand and his army against Rome, which city he occupied on the 29th of November. Championnet, commander of the French forces in southern Italy, brought one more flash of triumph to his country's arms; though heavily outnumbered, he drove Ferdinand out of Rome, followed him to Naples, and took the city by storm after desperate street fighting at the end of December. At Naples, as elsewhere, France set up a vassal state, the Parthenopean Republic, that lived but few weeks and ended in tragedy. For early in the year 1799, Austria and Russia placed an army in the field in northern Italy, the war with Austria beginning in March. Its first events took place in Germany, where Jourdan, for the fourth time attempting to force his way through the valley of the Danube, once more met with failure. The Archduke Charles fought him at Stockach, and there defeated him. This defeat gave the northern command to Massena and sent Jourdan {255} back to politics. When, some years later, the victor of Fleurus was again entrusted with the command of large armies, it was only to lead them to failure at Talavera, and to disaster at Vittoria.