Question: who were the romans fighting in gladiator movie
[{'answer': 'Germanic tribes', 'provenance': [{'wikipedia_id': '3616797', 'title': 'Gladiator (2000 film)', 'start_paragraph_id': 5, 'start_character': 141, 'end_paragraph_id': 5, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '3616797', 'title': 'Gladiator (2000 film)', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 425, 'bleu_score': 0.8032153244362751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13276852905430103037}, 'section': 'Section::::Plot.\n'}]}]