義常は1180年石橋山の合戦では大庭景親と共に頼朝軍を破り、頼朝の鎌倉入りの際にも一族と共に松田城に籠り抗戦をしたが、義常は頼朝に追われ自害をした。

Yoshitsune defeated the Yoritomo's army at the Battle of Ishibashiyama in 1180 along with Kagechika OBA, and he held Matsuda-jo Castle to offer resistance with his family when Yoritomo entered Kamakura, but he was forced out by Yoritomo and killed himself. - Wikipedia日英京都関連文書対訳コーパス

頼朝、平家追討の旗を挙げ、石橋山の合戦にて敗れ房総に落ち延びた折、味方に参じた千葉常胤の屋敷にて、かの陸奥六郎義隆の遺児を引き合わされた。

Using the pretext of hunting down the Taira family, Yoritomo was defeated at the Battle of Ishibashiyama, and upon escaping to Boso, the estate of his ally Tsunetane CHIBA, he was brought together with the orphan of Mutsu Rokuro Yoshitaka. - Wikipedia日英京都関連文書対訳コーパス

物語ではあるが、『曽我物語』（真字本：まなぼん）に見る頼朝挙兵前の開発領主の姻戚関係を見ると、大庭御厨の濫妨から、石橋山の合戦までの相模近辺の武士団の関係、勢力範囲がよく表されている。

The relationship of bushidan and range of power of Sagami Province was described in detail from the disturbance in Obamikuriya estate to the Battle of Ishibashiyama Mountain by looking at the matrimonial relation of kaihatsu-ryoshu prior to the mobilization call by Yoritomo in "Soga Monogatari" (the tale of Soga) (Manabon - a book written only in Chinese characters) despite being just literature. - Wikipedia日英京都関連文書対訳コーパス