Life
He was the second son of Sanada Masayuki, his elder brother was Sanada Nobuyuki. He was married to Akihime (Chikurin'in), a foster-daughter of Ōtani Yoshitsugu. They had two sons, Daisuke (Yukimasa) and Daihachi (Morinobu).
In 1575, the Battle of Nagashino claimed the lives of two of Sanada Masayuki's elder brothers. Masayuki, previously serving Takeda Shingen and Takeda Katsuyori as a retainer, inherited the Sanada clan and left for Ueda Castle. Yukimura also went, taking the Sanada name as well.
By 1582, the Oda-Tokugawa forces had destroyed the Takeda clan. The Sanada initially surrendered to Oda Nobunaga, but, after the Incident at Honnōji, it became independent again, drifting between stronger daimyo such as the Uesugi clan, the Late Hōjō clan, and the Tokugawa clan. Eventually, the Sanada clan became a vassal of Toyotomi Hideyoshi.
In 1600, before the Battle of Sekigahara, Tokugawa Ieyasu rallied various daimyo to attack Uesugi Kagekatsu. The Sanada clan complied as well, but when Ishida Mitsunari decided to challenge Ieyasu, Masayuki and Yukimura joined the western forces, parting ways with Masayuki's eldest son and Yukimura's brother, Nobuyuki (真田 信之, originally 真田 信幸), who joined the eastern forces. It has been said that at first Yukimura followed Ieyasu but, after Ieyasu tried to seize his territory he betrayed Ieyasu. The true motive of Masayuki and Yukimura's decision is disputed with many theories, but there are two main schools of thought: in one, Masayuki made the decision (and Yukimura agreed); he expressed the willingness to take a gamble, so that if he were to join the weak side and win the battle, the Sanada would gain much more power. The other theory is the opposite where they planned a safety net; Masayuki, Yukimura, and Nobuyuki discussed the situation when Ieyasu asked them to state their allegiance clearly, and they decided to join both sides separately, so that, regardless of the outcome of the battle, the Sanada clan would survive.
The Sanada retreated and fortified Ueda Castle. When Tokugawa Hidetada marched a sizable army on the Nakasendō, the Sanada resisted and were able to fight Hidetada's 40,000 men with only 2,000. However, as it took much longer to take the castle than was expected, Hidetada lost focus and never showed up for the Battle of Sekigahara where the main force was awaiting the arrival of his crucial army, a mistake that put the Tokugawa clan in jeopardy. After the battle, his territory was seized but he gathered an army in secret and rose when the Winter Battle of Osaka Castle broke out in 1615.
Read more about this topic: Sanada Yukimura
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