Question: when did the battle of marne take place
[{'answer': '6 -- 10 September 1914'}, {'provenance': [{'wikipedia_id': '171325', 'title': 'First Battle of the Marne', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 740, 'bleu_score': 0.8403092366413011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18139259712130050625}, 'section': 'Section::::Abstract.'}]}]