The Taira, controlling the region along the Inland Sea, defeated the Minamoto armies based in the Kanto province east of the capital.
The Minamoto armies were based in the Kanto province.
mnli hypothesis: The Minamoto armies were based in the Kanto province. premise: The Taira, controlling the region along the Inland Sea, defeated the Minamoto armies based in the Kanto province east of the capital.