Scorching heat and fierce winds drove devastating wildfires across western Europe on Friday, forcing France to request EU assistance and pushing Spain's Madrid region to declare a state of emergency.In France, authorities ordered a complete evacuation of the Cap Ferret peninsula—a popular summer getaway on the Atlantic coast. Boats were dispatched to ferry residents and tourists out of the area as a massive blaze closed in. The order, affecting an enclave packed with high-value holiday homes and...