Question: who was the man in charge of the us military at harper's ferry
[{'answer': 'First Lieutenant Israel Greene', 'provenance': [{'wikipedia_id': '19825348', 'title': "John Brown's raid on Harpers Ferry", 'start_paragraph_id': 2, 'start_character': 70, 'end_paragraph_id': 2, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19825348', 'title': "John Brown's raid on Harpers Ferry", 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 608, 'bleu_score': 0.614183003580951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2508450224708327242}, 'section': 'Section::::Abstract.'}]}]