France–Germany relations of the further integration of the EU. They are sometimes described as the "twin engine" or "core countries" pushing for moves. A tram straddling the Franco-German border, across the river Rhine from Strasbourg to Kehl, was inaugurated on the 28th of April 2017 symbolising the strength of relation between the two countries. Both France and Germany track their history back to the time of Charlemagne, whose vast empire included most of the area of both modern-day France and Germany – as well as the Netherlands, Belgium, Luxembourg, Switzerland, Austria, Slovenia, and northern Italy. The death of Charlemagne's son Louis the
Catholic Church and Nazi Germany the Vatican that the Germans planned to invade France through the Netherlands and Belgium on May 10. On May 7, Alfred Jodl noted in his diary that the Germans knew the Belgian envoy to the Vatican had been tipped off, and the Fuehrer was greatly agitated by the danger of treachery. Following the Fall of France, peace overtures continued to emanate from the Vatican as well as Sweden and the United States, to which Churchill responded resolutely that Germany would first have to free its conquered territories. In Rome in 1942, US envoy Myron C. Taylor, thanked the Holy See