The Battle of Brienne and the Battle of La Rothière were the chief incidents of the first stage of the celebrated 1814 campaign in north-east France, and they were quickly followed by victories of Napoleon over Blücher at Champaubert, Vauchamps, and Montmirail. The courage of the Prussian leader was undiminished, though, and his victory against the vastly outnumbered French, at Laon (9 and 10 March) practically decided the fate of the campaign. However, his health had been severely affected by the strains of the previous two months, and he now suffered a breakdown, during which he lost his sight and suffered a delusion that a Frenchman had impregnated him with an elephant. Dominic Lieven wrote that the breakdown, "revealed the fragility of the coalition armies' command structure and just how much the Army of Silesia had depended on Blücher's drive, courage, and charisma... The result was that for more than a week after the battle of Laon, the Army of Silesia... played no useful role in the war".