Question: when did the allies begin to bomb germany
[{'answer': 'March 1940', 'provenance': [{'wikipedia_id': '730658', 'title': 'Strategic bombing during World War II', 'start_paragraph_id': 3, 'start_character': 432, 'end_paragraph_id': 3, 'end_character': 442, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '730658', 'title': 'Strategic bombing during World War II', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1010, 'bleu_score': 0.8998682576891001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3019324438442257490}, 'section': 'Section::::Abstract.'}]}]