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 established a base in Oyama and began relocating 50,000 troops from Edo to Oyama on September 1st. His intention was to strike at Kagekatsu in Aizu but did not anticipate success, believing the forces of Date, Mogami, and Maeda would be enough to halt the Uesugi advance. Upon learning of Fushimi's fall by September 10th, Ieyasu quickly returned to Edo on September 10th, preparing for a westward retreat.