Question: who fought in the battle of pea ridge
[{'answer': 'Confederate forces', 'provenance': [{'wikipedia_id': '299387', 'title': 'Battle of Pea Ridge', 'start_paragraph_id': 1, 'start_character': 287, 'end_paragraph_id': 1, 'end_character': 305, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Major - General Earl Van Dorn'}, {'answer': 'Federal forces , led by Brigadier - General Samuel R. Curtis'}, {'provenance': [{'wikipedia_id': '299387', 'title': 'Battle of Pea Ridge', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 568, 'bleu_score': 0.6542412399199761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4806045652759979575}, 'section': 'Section::::Abstract.'}]}]