Question: when was the grand army of the republic formed
[{'answer': 'April 6 , 1866', 'provenance': [{'wikipedia_id': '173067', 'title': 'Grand Army of the Republic', 'start_paragraph_id': 3, 'start_character': 462, 'end_paragraph_id': 3, 'end_character': 476, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '173067', 'title': 'Grand Army of the Republic', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 588, 'bleu_score': 0.9236799386190421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8508865888543747222}, 'section': 'Section::::History.\n'}]}]