In this difficult situation the King attempted to enter cautiously into an alliance with the Sixth Coalition in 1813 without risking a public break with Napoleon and a declaration of war. As the Prussian and Russian troops entered Saxony in the spring, the King first moved to the south in order to avoid a direct encounter and pursued an alliance with Austria secretly from Regensburg. The Saxon-Austrian Pact was concluded on 20 April and the King made the Prussian and Russian allies aware of it at the same time. Napoleon, from whom Frederick Augustus was not able to keep the diplomatic maneuvers concealed, summoned the King urgently to Saxony after he had defeated the Prusso-Russian troops at Lützen on 2 May. Frederick Augustus decided to comply with the ultimatum presented to him. With no prospect of concrete assistance from Austria, and in view of the defeat of the Prussian – Russian coalition, which now sent peace signals to France, he felt he had no choice.