 Complete the following phrase:  Having taken power in France during the 18 Brumaire on 9 November 1799, Napoleon was determined to return to Italy to reinforce the French troops in the country and retake the territory seized by the Austrians in the preceding years. In the spring of 1800 he led the Reserve Army across the Alps through the Great St Bernard Pass. The Austrian forces, under Michael von Melas, were laying siege to Masséna in 