According to the "Azuma Kagami (Mirror of Eastern Japan; historical account of the Kamakura bakufu (Japanese feudal government headed by a shogun))" Hirokata participated in the War of Jokyu (attempt by the Retired Emperor Gotoba to overthrow the Kamakura bakufu) in 1221 on the side of Yasutoki HOJO (the Kamakura bakufu); Hirokata showed an achievement that he himself and his brother Shiro SHO each captured one enemy alive at the Battle of Uji-bashi Bridge of Yamashiro Province, while one of their brothers Saburo Tadaie was killed in that battle.
『吾妻鏡』によれば、承久3年（1221年）に起きた承久の乱において、北条泰時（鎌倉幕府）軍に従い、山城国の宇治橋合戦で、庄四郎と共に敵を一人ずつ生け捕る功績を上げるが、この戦で兄の一人である三郎忠家が戦死している。