Mōri Terumoto
Ishida, in his home Sawayama Castle, met with Ōtani Yoshitsugu, Mashita Nagamori, and Ankokuji Ekei. Here, they forged their alliance, and invited Mōri Terumoto to be its head. They formed what came to be referred to as the Western Army. Mōri seized Osaka Castle for their base of operations, since most of Tokugawa's forces had vacated the area to attack Uesugi.