Nobunaga understood the message and retreated from his brother-in-law's assault in time. The fighting continued for three years until the Asakura and other anti-Oda forces were destroyed or weakened. Oichi remained with her husband at Odani Castle throughout the conflict, even after Toyotomi Hideyoshi, a trusted vassal of Nobunaga at the time, began laying siege to the castle. In the Siege of Odani Castle, Nobunaga requested that his sister be returned to him before the final attack. Nagamasa agreed, sending out Oichi and her three daughters. Nagamasa had no hope of winning, and chose to commit seppuku. Oichi and her daughters remained in the Oda family's care for the next decade. After Nobunaga was assassinated in 1582, his sons and vassals broke into two major factions, led by two of Nobunaga's favored generals, Shibata Katsuie and Hideyoshi. Nobunaga's third son, Nobutaka, belonged to the former group, and arranged for his aunt Oichi to marry Katsuie in order to ensure his loyalty to the Oda clan. But in 1583, Katsuie was defeated by Hideyoshi in the Battle of Shizugatake, forcing him to retreat to his home at Kitanosho Castle. As Hideyoshi's army lay siege to the castle, Katsuie implored Oichi to flee with her daughters and seek Hideyoshi's protection. Oichi refused, insisting on dying with her husband after their daughters were sent away. Her daughters were placed in the care of by Hideyoshi; the oldest daughter, Yodo-dono (also known as Chacha), eventually became one of Hideyoshi's concubines and the mother of his heir. Oichi's daughters Oichi's three daughters each went on to become important historical figures in their own right. The eldest and the most famous, Chacha became a concubine to Hideyoshi, whose army had killed not only both her birth parents but also her stepfather. She became known as Yodo-dono or Yodogimi (from Yodo Castle, given to her by Hideyoshi), and she bore him his only two sons, including his heir Hideyori. Yodo-dono and Hideyori later died in the siege of Osaka, in 1615, the final battle of the warring-states era. The second, Ohatsu, married Kyōgoku Takatsugu, a man from a noble family once served by the Azai clan. The Kyogoku clan sided with Ieyasu after Hideyoshi's death, giving her the means to serve as an intermediary between Ieyasu and Yodo-dono. She worked in vain to end their hostilities, and after Yodo-dono and Hideyori's death, managed to save Hideyori's daughter