On May 12, by taking the opportunity, the detached 2nd brigade started advancing towards the south along five roads in the northern part of the Kuma Basin including the Goka-no-sho-do Road.
そこを突いて5月12日、別働第2旅団は球磨盆地の北部にある五家荘道等の5つの街道から南下し始めた。