Question: who warned concord that the british were coming
[{'answer': 'Samuel Prescott', 'provenance': [{'wikipedia_id': '769195', 'title': 'Samuel Prescott', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '769195', 'title': 'Samuel Prescott', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 391, 'bleu_score': 0.9699161750394991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5988233679513630839}, 'section': 'Section::::Abstract.'}]}]