The high-speed train whooshing past historic World War I battle sites and through the chateau-speckled Loire Valley carried a delicate cargo: 20 critically ill COVID-19 patients and the breathing machines helping keep them alive. The TGV-turned-mobile-intensive-care-unit is just one piece of France's nationwide mobilization of trains, helicopters, jets and even a warship, deployed to relieve congested hospitals and shuffle hundreds of patients and medical personnel in and out of coronavirus hotspots. “We are at war,” President Emmanuel Macron tells his compatriots, again and again.