From about 1900, Francophiles in Britain and Anglophiles in France began to spread a study and mutual respect and love of the culture of the country on the other side of the English Channel. Francophile and Anglophile societies developed, further introducing Britain to French food and wine, and France to English sports like rugby. French and English were already the second languages of choice in Britain and France respectively. Eventually this developed into a political policy as the new united Germany was seen as a potential threat. Louis Blériot, for example, crossed the Channel in an aeroplane in 1909. Many saw this as symbolic of the connection between the two countries. This period in the first decade of the 20th century became known as the "Entente Cordiale", and continued in spirit until the 1940s. The signing of the Entente Cordiale also marked the end of almost a millennium of intermittent conflict between the two nations and their predecessor states, and the formalisation of the peaceful co-existence that had existed since the end of the Napoleonic Wars in 1815. Up to 1940, relations between Britain and France were closer than those between Britain and the US. This also started the beginning of the French and British "Special Relationship". After 1907 the British fleet was built up to stay far ahead of Germany. However Britain nor France committed itself to entering a war if Germany attacked the other.