Shingen's first act was to gain a hold of the area around him. His goal was to conquer
Shinano Province. A number of the major daimyos in the Shinano region marched on the border of
Kai Province, hoping to neutralize the power of the still-young Shingen before he had a chance to expand into their lands. However, planning to beat him down at Fuchu (where word had it Shingen was gathering his forces for a stand), they were unprepared when
Takeda forces suddenly came down upon them at the
battle of Sezawa. Taking advantage of their confusion, Shingen was able to score a quick victory, which set the stage for his drive into Shinano lands that same year. The young warlord made considerable advances into the region, conquering the Suwa headquarters in the
siege of Kuwabara before moving into central Shinano with the defeat of both Tozawa Yorichika and Takato Yoritsugu. However, the warlord was checked at Uehara by
Murakami Yoshikiyo, losing two of his generals in a heated battle in which Murakami came out on top. Shingen managed to avenge this loss and the Murakami clan was eventually defeated. Murakami fled the region, eventually coming to plead help from the
Uesugi clan.
After he had conquered Shinano, Shingen (who had changed his name to this in 1551) faced another rival,
Uesugi Kenshin of Echigo. The feud between these two became almost legendary, and they faced each other on the battlefield a total of five times at the
battles of Kawanakajima. These battles were generally confined to controlled skirmishes, neither daimyo willing to devote himself entirely to a single all-out attempt. The one conflict between the two that had the fiercest fighting, and might have decided victory or defeat for one side or the other, was the fourth such battle. It was in this fourth contest that the famous tale was formed of
Uesugi Kenshin's forces clearing a path through the Takeda troops and Kenshin engaging Shingen in single combat. The tale has Kenshin attacking Shingen with his sword while Shingen defends with his iron war fan or
tessen. Both lords lost a considerable number of men in this fight, and Shingen in particular was deprived of two of his main generals,
Yamamoto Kansuke and his younger brother
Takeda Nobushige.