Meanwhile, Napoleon had launched a great attack on the Austrian center. The whole of the French center, with Lannes on the left and the cavalry in reserve, moved forward. The Austrian line was broken through, between Rosenberg's right and Hohenzollern's left, and the French squadrons poured into the gap. Victory was almost won when the Archduke brought up his last reserve, leading his soldiers with a colour in his hand. Lannes was checked, and with his repulse the impetus of the attack died out all along the line. Aspern had been lost, and graver news reached Napoleon at the critical moment. The Danube bridges, which had broken down once already, had been cut by heavy barges, which had been sent drifting down stream by the Austrians.