Fukushima Masanori
When the Sekigahara Campaign began in the fall of 1600, Terumasa immediately sided with his father-in-law, Tokugawa. On 28 September he competed with Fukushima Masanori to be the first to attack Gifu Castle, held by Oda Hidenobu. At the Battle of Sekigahara, Ikeda commanded 4,560 troops in the rear guard and saw some desultory fighting with Chosokabe Morichika's contingent as the battle wound down.