When the British Army went ashore at Normandy, private Bill Millin was wearing a Cameron tartan kilt and playing “Hielan’ Laddie” on his bagpipes. Unarmed except for a ceremonial dagger, he marched up and down the water’s edge, blasting out tunes, and miraculously was not hit. Millin was personal piper to Lord Lovat, commander of 1st Special Service Brigade. The War Office had banned pipers from leading soldiers into battle after many were lost in World War I. “But that’s the English War Office,” Lovat told him. “You and I are both Scottish, and that doesn’t apply.” “Mad Jack” Churchill...