On 29 August, Ieyasu had established a base of operations in Oyama, and by 1 September Ieyasu began relocating 50,000 troops mustered in Edo north to Oyama, preparing to strike at Kagekatsu in Aizu but not expecting to do so, believing the Date, Mogami and Maeda forces sufficient to halt the Uesugi advance. With the news of the fall of Fushimi, Ieyasu quickly returned to Edo by 10 September, already planning a westward return.
On August 29th, Ieyasu set up a base in Oyama and began moving troops from Edo to prepare for an attack on Kagekatsu in Aizu. He expected the forces of Date, Mogami, and Maeda to be sufficient to stop the Uesugi advance but did not anticipate their effectiveness. Upon learning of Fushimi's fall by September 10th, Ieyasu returned to Edo on September 10th, planning a westward retreat.