Question: union generals civil war army of the potomac
[{'answer': 'George B. McClellan', 'provenance': [{'wikipedia_id': '222590', 'title': 'Army of the Potomac', 'start_paragraph_id': 3, 'start_character': 379, 'end_paragraph_id': 3, 'end_character': 398, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Ambrose Burnside', 'provenance': [{'wikipedia_id': '222590', 'title': 'Army of the Potomac', 'start_paragraph_id': 5, 'start_character': 104, 'end_paragraph_id': 5, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Joseph Hooker', 'provenance': [{'wikipedia_id': '222590', 'title': 'Army of the Potomac', 'start_paragraph_id': 30, 'start_character': 26, 'end_paragraph_id': 30, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Commanders.\n'}]}, {'answer': 'George G. Meade', 'provenance': [{'wikipedia_id': '222590', 'title': 'Army of the Potomac', 'start_paragraph_id': 31, 'start_character': 26, 'end_paragraph_id': 31, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Commanders.\n'}]}]