Question: who was the union general in the first battle of bull run
[{'answer': 'Brig. Gen. Irvin McDowell', 'provenance': [{'wikipedia_id': '228867', 'title': 'First Battle of Bull Run', 'start_paragraph_id': 2, 'start_character': 244, 'end_paragraph_id': 2, 'end_character': 269, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '228867', 'title': 'First Battle of Bull Run', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 684, 'bleu_score': 0.9366301683723761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8427990127202025584}, 'section': 'Section::::Abstract.'}]}]