In the years following the Treaty of Paris of 1763, Choiseul attempted to rebuild the French military. Alarmed by the British victory in the Seven Years' War and the upset in the European balance of power that followed, he tried to secure continued Spanish support for a future war of revenge against Britain and drew up a number of plans for an invasion of Britain. In an effort to compensate for French territorial losses, he added Corsica and Lorraine to the crown of France. He directed the French conquest of Corsica. He also oversaw a failed scheme to settle Guiana. By the late 1760s Choiseul was concerned by the growing strength of Russia around the Baltic Sea fearing that Britain was behind it. He believed they were planning a "northern league" against France. To counter this he hoped to depose or severely weaken the power of Catherine the Great by encouraging the Ottoman Empire to attack Russia.