Question: world war 1 attacks often began with a of cannon fire
[{'answer': 'bombardment', 'provenance': [{'wikipedia_id': '182259', 'title': 'Trench warfare', 'start_paragraph_id': 30, 'start_character': 177, 'end_paragraph_id': 30, 'end_character': 188, 'bleu_score': 1.0, 'section': 'Section::::World War I: Entrenchment.:Implementation.\n'}]}, {'provenance': [{'wikipedia_id': '182259', 'title': 'Trench warfare', 'start_paragraph_id': 70, 'start_character': 0, 'end_paragraph_id': 70, 'end_character': 463, 'bleu_score': 0.942340155314736, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18164267809911309885}, 'section': 'Section::::World War I: Life in the trenches.\n'}]}]