Question: where was the first major battle for african american troops in the union army
[{'answer': 'the Battle of Fort Wagner', 'provenance': [{'wikipedia_id': '360126', 'title': 'Union Army', 'start_paragraph_id': 52, 'start_character': 178, 'end_paragraph_id': 52, 'end_character': 203, 'bleu_score': 1.0, 'section': 'Section::::Army administration and issues.:Blacks in the army.\n'}]}, {'provenance': [{'wikipedia_id': '360126', 'title': 'Union Army', 'start_paragraph_id': 52, 'start_character': 0, 'end_paragraph_id': 52, 'end_character': 869, 'bleu_score': 0.9860618656782161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12953517484798610177}, 'section': 'Section::::Army administration and issues.:Blacks in the army.\n'}]}]