 The siege was part of Takeda Katsuyori's raid through Mikawa province; Yoshida Castle lay on the site of what is now part of Toyohashi city in Aichi Prefecture.Sakai Tadatsugu commanded the castle's garrison in service of Tokugawa Ieyasu.Though the garrison normally numbered 1,000 men, Ieyasu anticipated the attack and reinforced Sakai's forces with 5,000 more warriors.