Question: soldier nickname given to 19th century us cavalrymen fighting on the frontier
[{'answer': 'walkaheaps', 'provenance': [{'wikipedia_id': '1583811', 'title': 'United States Cavalry', 'start_paragraph_id': 27, 'start_character': 329, 'end_paragraph_id': 27, 'end_character': 339, 'bleu_score': 1.0, 'section': 'Section::::History.:Indian wars.\n'}]}, {'provenance': [{'wikipedia_id': '1583811', 'title': 'United States Cavalry', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 531, 'bleu_score': 0.9757530668325981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14972046542995471124}, 'section': 'Section::::History.:Indian wars.\n'}]}]