Task: Explanation
Input (English): George R. Crook (September 8, 1830 – March 21, 1890) was a career United States Army officer, most noted for his distinguished service during the American Civil War and the Indian Wars. During the 1880s, the Apache nicknamed Crook "Nantan Lupan", which means "Chief Wolf." Question: What was the Apache nickname given to General under which William B Royall served? Answer: Nantan Lupan
Output (English):  During the 1880s, the Apache nicknamed Crook Nantan Lupan, which means Chief Wolf.