Question: Before 21 Lithuanian dukes signed a peace treaty with Galicia–Volhynia, what is an example of the war-related functions the group who made up the majority of the military-economic staff of the state performed?
{'answer': 'breeding riding horses', 'supporting_facts': [['Leičiai', 1], ['Leičiai', 2], ['History of Lithuania (1219–95)', 1], ['History of Lithuania (1219–95)', 3]]}