 Meanwhile, the British still refused to help Maria Theresa in reclaiming Silesia, and Frederick II himself managed to secure the Treaty of Westminster (1756) with them.Subsequently, Maria Theresa sent Georg Adam, Prince of Starhemberg to negotiate an agreement with France, and the result was the First Treaty of Versailles of 1 May 1756.Thus, the efforts of Kaunitz and Starhemberg managed to pave a way for a Diplomatic Revolution; previously, France was one of Austria's archenemies together with Russia and the Ottoman Empire, but after the agreement, they were united by a common cause to contain Frederick II and British colonial expansion.