In late October, the Imperial constitution was heavily amended to transform the empire into a British-style constitutional monarchy. However, Wilson's third note seemed to imply that negotiations for an armistice would be dependent on the abdication of Wilhelm II. Max and his government now feared that a military collapse and a socialist revolution at home were becoming likelier with every day that went by. In fact, the government's efforts to secure an armistice were interrupted by the Kiel mutiny, which began with events at Wilhelmshaven on 30 October and the outbreak of revolution in Germany in early November. On 1 November, Max wrote to all the ruling Princes of Germany, asking them whether they would approve of an abdication by the Emperor. On 6 November, the Chancellor sent Erzberger to conduct the negotiations with the Allies. Max, seriously ill with Spanish influenza, urged Wilhelm II to abdicate. The Emperor, who had fled from revolutionary Berlin to the Spa headquarters of the OHL in Belgium, despite similar advice by Hindenburg and Ludendorff's successor Wilhelm Groener of the OHL, was willing to consider abdication only as German Emperor, not as King of Prussia. This was not possible under the imperial constitution as it stood. Article 11 defined the empire as a confederation of states under the permanent presidency of the king of Prussia, meaning that the imperial crown was tied to the Prussian crown.