Question: who led the union forces to victory at the battle of shiloh
[{'answer': 'Major General Ulysses S. Grant', 'provenance': [{'wikipedia_id': '144155', 'title': 'Battle of Shiloh', 'start_paragraph_id': 1, 'start_character': 233, 'end_paragraph_id': 1, 'end_character': 263, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Maj. Gen. Don Carlos Buell'}, {'provenance': [{'wikipedia_id': '144155', 'title': 'Battle of Shiloh', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1048, 'bleu_score': 0.9343862737540211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14615658178619845292}, 'section': 'Section::::Abstract.'}]}]