In 1916, Hallie Crawford went to teach school in Presidio, just across the Rio Grande from Ojinaga, Mexico, which had been recently captured by Pancho Villa. Hallie's father, considering this a dangerous place for a young woman of nineteen to live alone, told her he thought she was going on a wild goose chase. "Then I'll gather my geese," she told him, with determination and independence. These traits stayed with Hallie all her life, and were indispensable...