Question: which battle ended britain's support for the south
[{'answer': 'the Battle of Antietam', 'provenance': [{'wikipedia_id': '20834817', 'title': 'United Kingdom and the American Civil War', 'start_paragraph_id': 35, 'start_character': 73, 'end_paragraph_id': 35, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Possibility of recognizing Confederacy.\n'}]}, {'answer': 'Battle of Antietam', 'provenance': [{'wikipedia_id': '20834817', 'title': 'United Kingdom and the American Civil War', 'start_paragraph_id': 35, 'start_character': 77, 'end_paragraph_id': 35, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Possibility of recognizing Confederacy.\n'}]}, {'provenance': [{'wikipedia_id': '20834817', 'title': 'United Kingdom and the American Civil War', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11475356577955587586}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20834817', 'title': 'United Kingdom and the American Civil War', 'start_paragraph_id': 41, 'start_character': 0, 'end_paragraph_id': 41, 'end_character': 935, 'bleu_score': 0.9863473221773311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11475356577955587586}, 'section': 'Section::::Confederate diplomacy.\n'}]}, {'provenance': [{'wikipedia_id': '20834817', 'title': 'United Kingdom and the American Civil War', 'start_paragraph_id': 35, 'start_character': 0, 'end_paragraph_id': 35, 'end_character': 500, 'bleu_score': 0.9766041382465441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11475356577955587586}, 'section': 'Section::::Possibility of recognizing Confederacy.\n'}]}, {'provenance': [{'wikipedia_id': '20834817', 'title': 'United Kingdom and the American Civil War', 'section': 'Section::::Possibility of recognizing Confederacy.\n', 'start_paragraph_id': 35, 'end_paragraph_id': 35, 'meta': {'evidence_span': ["The decisive factor, in the fall of 1862 and increasingly thereafter was the Battle of Antietam and what grew out of it. Lee's invasion was a failure at Antietam, and he barely escaped back to Virginia.", 'Battle of Antietam', "The decisive factor, in the fall of 1862 and increasingly thereafter was the Battle of Antietam and what grew out of it. Lee's invasion was a failure at Antietam, and he barely escaped back to Virginia. It was now obvious that no final, conclusive Confederate triumph could be anticipated. The swift recession of the high Confederate tide was as visible in Britain as in America, and in the end, Palmerston and Russell dropped any notion of bringing a mediation-recognition program before the cabinet."]}}]}]