Sakuma Morimasa
Encyclopedia
was the son of Sakuma Moritsugu, cousin of Sakuma Nobumori
Sakuma Nobumori
was a retainer for the Oda clan. Nobumori's banishment by Oda Nobunaga to Mount Koyasan has widely been regarded as symbolic of Nobunaga's ruthlessness against even his longest-serving retainers, highlighting the leader's shortcomings as a military commander....

, a prominent Oda retainer to Oda Nobuhide
Oda Nobuhide
was a warlord and magistrate of lower Owari Province during the Sengoku period of Japan. His father was Oda Nobusada and Nobuhide was the father of Oda Nobunaga.-Ruling the clan:...

 and Oda Nobunaga
Oda Nobunaga
was the initiator of the unification of Japan under the shogunate in the late 16th century, which ruled Japan until the Meiji Restoration in 1868. He was also a major daimyo during the Sengoku period of Japanese history. His opus was continued, completed and finalized by his successors Toyotomi...

. He was a retainer of Shibata Katsuie
Shibata Katsuie
or was a Japanese military commander during the Sengoku Period who served Oda Nobunaga.-Biography:Katsuie was born in the Shibata family, a branch of the Shiba clan . Note the differences between , , and the .Katsuie was the retainer of Oda Nobukatsu...

 and one of his top generals in many of his campaigns. Morimasa was given the former Ikko Sect fortress Oyama Gobo in the Kaga prefecture by Oda Nobunaga; the fortress was subsequently named Oyama Castle in 1580 but went on to become Kanazawa Castle. After several campaigns in which he had fought, he was given the nickname onigenba which literally means "Demon Genba", Genba being his middle name.

After the betrayal of Akechi Mitsuhide
Akechi Mitsuhide
, nicknamed Jūbei or called from his clan name and title, was a samurai who lived during the Sengoku period of Feudal Japan.Mitsuhide was a general under daimyo Oda Nobunaga, although he became infamous for his betrayal in 1582, which led to Nobunaga's death at Honno-ji...

 which led to the death of both Oda Nobunaga
Oda Nobunaga
was the initiator of the unification of Japan under the shogunate in the late 16th century, which ruled Japan until the Meiji Restoration in 1868. He was also a major daimyo during the Sengoku period of Japanese history. His opus was continued, completed and finalized by his successors Toyotomi...

 and his heir Oda Nobutada
Oda Nobutada
was the eldest son of Oda Nobunaga, and a samurai who fought in many battles during the Sengoku period. He commanded armies under his father in battles against Matsunaga Hisahide and against the Takeda clan....

, Morimasa sided with Shibata Katsuie
Shibata Katsuie
or was a Japanese military commander during the Sengoku Period who served Oda Nobunaga.-Biography:Katsuie was born in the Shibata family, a branch of the Shiba clan . Note the differences between , , and the .Katsuie was the retainer of Oda Nobukatsu...

 over making Oda Nobutaka
Oda Nobutaka
was a samurai and member of Oda clan. He was adopted as the head of Kanbe clan that ruled the middle region of Ise Province and was also called Kanbe Nobutaka ....

 (the third son of Nobunaga) as heir to the Oda clan whereas Hashiba Hideyoshi (later Toyotomi Hideyoshi
Toyotomi Hideyoshi
was a daimyo warrior, general and politician of the Sengoku period. He unified the political factions of Japan. He succeeded his former liege lord, Oda Nobunaga, and brought an end to the Sengoku period. The period of his rule is often called the Momoyama period, named after Hideyoshi's castle...

) supported Lord Sanboshi. Sanboshi was the heir to Oda Nobutada and was still an infant at that time. This argument led to the split of the Oda clan retainers into the two main factions led by Shibata Katsuie and Hashiba Hideyoshi.

Armies of the two factions eventually came to war. In 1583, Morimasa led an offensive against Takayama Ukon
Dom Justo Takayama
Dom Justo Takayama was a kirishitan daimyo and a Japanese Samurai who followed Christianity in the Sengoku period of Japan...

 in Iwasakiyama. Morimasa then proceeded against Shibata Katsuie's orders and defeated Nakagawa Kiyohide
Nakagawa Kiyohide
Nakagawa Kiyohide was a daimyo in Azuchi-Momoyama period.His childhood name was Nakagawa Toranosuke...

 at the battle of Shizugatake
Battle of Shizugatake
The was a battle in Sengoku period Japan between supporters of Toyotomi Hideyoshi and Oda Nobutaka.In May, 1583, a former general of Nobunaga's named Shibata Katsuie coordinated a number of simultaneous attacks on Shizugatake, a series of forts held by Hideyoshi's generals among whom was Nakagawa...

 in 1583, further ignored orders by Shibata Katsuie to fall back led to his defeat as Toyotomi Hideyoshi
Toyotomi Hideyoshi
was a daimyo warrior, general and politician of the Sengoku period. He unified the political factions of Japan. He succeeded his former liege lord, Oda Nobunaga, and brought an end to the Sengoku period. The period of his rule is often called the Momoyama period, named after Hideyoshi's castle...

's forces approached the next morning. Morimasa continually ignored the orders to retreat and did not abandon his position where he engaged the enemy. Despite calls for reinforcements he was subsequently defeated. Morimasa then attempted to flee, but was captured and beheaded.

The charge by Morimasa was the spark necessary for the battle of Shizugatake
Battle of Shizugatake
The was a battle in Sengoku period Japan between supporters of Toyotomi Hideyoshi and Oda Nobutaka.In May, 1583, a former general of Nobunaga's named Shibata Katsuie coordinated a number of simultaneous attacks on Shizugatake, a series of forts held by Hideyoshi's generals among whom was Nakagawa...

 where Hideyoshi's troops were able to suppress any resistance led by Maeda Toshiie
Maeda Toshiie
was one of the leading generals of Oda Nobunaga following the Sengoku period of the 16th century extending to the Azuchi-Momoyama period. His father was Maeda Toshimasa. He was the fourth of seven brothers. His childhood name was "Inuchiyo" . His preferred weapon was a yari and he was known as...

 and prevented the support of Sassa Narimasa
Sassa Narimasa
, also known as Kura-no-suke , was a Japanese samurai of the Sengoku through Azuchi-Momoyama period. He became a retainer of Oda Nobunaga in 1550 and was granted Etchū Province as a reward for helping Shibata Katsuie fight the Uesugi clan. After Nobunaga's death, in 1584 he joined Tokugawa Ieyasu...

 and Takigawa Kazumasu
Takigawa Kazumasu
, also known as Sakonshōgen , was a samurai retainer to Oda Nobunaga, and later Toyotomi Hideyoshi, during Japan's Sengoku period. His biological son, Toshimasu, was adopted by Maeda Toshihisa and later served Nobunaga alongside Kazumasu and Toshimasu's adopted uncle, Maeda Toshiie.Originally from...

. In all, Hideyoshi's troops swelled to 120,000 whereas Shibata Katsuie's troops had only reached 25,000. This eventually forced Shibata Katsuie to commit seppuku along with his wife Lady Oichi
Oichi
or a female historical figure in the late Sengoku period. She is known primarily as the mother of three daughters who married well -- Yodo-dono, Ohatsu and Oeyo....

(younger sister of Nobunaga) following the betrayal of Maeda Toshiie.
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