He visited the residence of Kanetaka YAMAKI for a feast immediately before the attack by Yoritomo, made a pictorial map of the topography of the surrounding area and brought it back so that Yoritomo and others worked out a plan of operations based on the map.
頼朝の旗挙げの初戦である山木兼隆襲撃の直前に、酒宴にかこつけて兼隆の館に留まり、周囲の地形を絵図にして持ち帰り、それを基に頼朝達が作戦を練った。