He competed with the Rokkaku clan and Kyogoku clan in Omi Province and consistently maintained independence, but as a great commander Sadayori ROKKAKU expanded his influence, Tanetsuna had no other choice than to yield allegiance as his subordinate.
近江国の六角氏や京極氏と争い、あくまで独立を維持していたが、名将・六角定頼が勢力を拡大してくると、その配下として服属せざるを得なくなったという。