Question: when was the last time horses were used in war
[{'answer': 'after World War I', 'provenance': [{'wikipedia_id': '7783929', 'title': 'Horses in warfare', 'start_paragraph_id': 4, 'start_character': 37, 'end_paragraph_id': 4, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7783929', 'title': 'Horses in warfare', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 918, 'bleu_score': 0.9867102250666441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14368602975022481055}, 'section': 'Section::::Abstract.'}]}]