If Noriyori had made a smart attack, too, he would have allowed Yoshinaka to escape from Kyoto to the west and lost a legitimate reason for a marching army, because there were not enough food supplies for 30,000 soldiers.
また範頼軍も強襲をすると、進軍の大義名分である義仲が西方面に逃亡してしまう危険性があり、なにより京都には3万の兵士をまかなえるだけの食糧もなかった。