Question: what was the first british battle of ww1
[{'answer': 'Battle of Mons', 'provenance': [{'wikipedia_id': '630014', 'title': 'Battle of Mons', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '630014', 'title': 'Battle of Mons', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 897, 'bleu_score': 0.970407102359722, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17324312909653500678}, 'section': 'Section::::Abstract.'}]}]