Tedorigawa

The Battle of Tedorigawa (手取川の戦い, Tedorigawa no Tatakai) is a supposed encounter between Kenshin and Nobunaga. It's famously known as Kenshin's decisive victory over the latter before his death. There are few records for the encounter and it's unknown if it actually occurred or if it's an overblown exaggeration of events. Proponents for the battle often claim that it was a victory for the Uesugi army, but recently historical records have been reexamined and they don't state the facts needed to clearly support who was the victor.

Samurai Warriors
In Samurai Warriors 2, the Uesugi side has Kenshin and Kanetsugu appear before Nobunaga's arrival on the field. Katsuie is confident in his army's numbers and tells his men to charge, but Mitsuhide and Hidesyohi hold their troops back. An order to destroy the floodgates in the south is issued by Kenshin, which requires Mitsuhide and Mornori Andō's swift defeat at Funaoka Castle. If the river floods the field, the map subtly changes as some of the bridges in the central area are submerged. Depending on when the gates are broken, Katsuie will either state that it was bad luck or pushes onward with the last of his strength. The Oda army lowers and the commander is vulnerable without any close generals to help him. Hideyoshi temporarily retreats at this time, later appearing to attack Kagekatsu. When Nobunaga arrives, Nō and Oichi attempt to cross the river and a secondary mission to stop them is given while they're on their march. After Ranmaru is defeated, Nobunaga's main camp is open and victory is easy to claim from there.

If the players rush across the river and ignores the flood gates, they can defeat Hideyoshi and Katsuie early. Nobunaga's arrival thereafter has the Uesugi abort the water attack.

The Oda side of the battle has Nobunaga send Hideyoshi and Katsuie to counter Kenshin's army. When they falter, their leader decides to personally ride out. Upon his arrival, Nobunaga orders his stranded allies to fall back on the western bank. Hideyoshi, Katsuie, Toshiie, Nagahide Niwa, and Kazumasu Takigawa are the specific generals needed to be rescued for Nobunaga's full counteroffensive. As the players do so, Mitsuhide is given the task of wiping out the Ikko Rebels in Funaoka Castle. He hesitates to follow his lord's rule and questions his own desires, eventually leaving from the field. His departure lowers ally morale and triggers Kenshin's plan to close the gates. Defeating Kanetsugu before he reaches Funaoka Castle saves the men and battlefield from more damage. As the charge from both armies commences, Kagekatsu and a small band of Ikko Rebels endanger the main camp.

If Nobunaga's army fails to save officers, then a large band of Ikko Rebels appear as Shigenaga Honjo's reinforcements and place Hideyoshi in danger. Failing to stop Kanetsugu triggers Uesugi reinforcements and makes the central bridges accessible once more. Kenshin orders his army to charge, putting the Oda army at a disadvantage.

Warriors Orochi
During Shu's sixth gaiden in the first game, Musashi and band of swordsmen are surrounded by the Orochi army lead by Mitsunari. They are heavily surrounded and are saved by the then wandering Meng Huo and Zhu Rong. To help tip the odds in their favor, Musashi suggests opening the gates at Fukaoka Castle while he asks the Shu army to help his swordsmen rivals. Lu Bu stands guard at the flood gate. Either eradicating the enemy army or opening the flood gate boosts the ally morale to charge Mitsunari's camp. Orochi reinforcements appear as the ally forces approach Mitsunari, but wiping them out is optional.

To recruit Musashi, the player needs to quickly open the flood gate while simultaneously protecting his comrades.

Kessen
If players chose to fight against Kenshin in chapter 8, the battle is given a brief mention through a cutscene in Kessen III. Katsuie and Toshiie confront the daimyo but lose their ground and flee to Kuzuryūgawa. On a misty day and not knowing his opponent's numbers, Nobunaga assists his men in their new location and faces Kenshin in a decisive encounter.

Events of Battle
In 1576, Uesugi Kenshin rode 20,000 troops into Noto Province with the intent of invading and ruling it as his own. Opposing him were the current lords of the province, the Hatakeyama clan. It is believed that Kenshin invaded Nanao Castle, which was then under the command of the family vassal, Chō Tsugutsura. Since the castle was a prominent location in the land, the struggle to defend it lasted for six months. Desperate to keep the castle in their command, Tsugutsura even forced the common folk and merchants to arms. However, the castle became filthy with piling amounts of feces and an epidemic spread as a result. The young lord of the Hatakeyama clan, Haruōmaru, died due to illness and the Hatakeyama troops were sent into confusion.

Tsugutsura then called upon Oda Nobunaga to his rescue and offered his son, Tsuratatsu, as a hostage in Azuchi Castle. Not wanting Kenshin to expand his influence, Nobunaga gathered troops immediately. He personally lead 30,000 while he sent Katsuie in advance with 18,000 soldiers. Before Nobunaga's arrival in October 26, Tsugutsura's generals, such as Yusa Tsugumitsu and Nukui Kagetaka, were dissatisfied with his performance and defected to the Uesugi. In their revolt, Tsugutsura was held responsible for the fall of the castle and was killed by a large group of soldiers. Nanao Castle fell into Kenshin's hands.

Before news of the revolt had reached them, Katsuie urged a march towards Nanao Castle. However, he apparently got in an argument for control with Hashiba Hideyoshi, who wanted to call off the assault due to what he perceived to be a collapse of internal affairs. Katsuie apparently ignored his warnings and continued onward. Eventually, the Oda army learned Kenshin's actions and ordered a temporarily retreat to Matto Castle by Tedorigawa. Katsuie was the first general to cross the river and, once he learned that Kenshin was in Nanao Castle, he tried to retreat as well. It is said that Kenshin's troops pursued Katsuie's men and, since it took time to cross the muddy banks, 1,000 men were said to have been lost in their flight. Katsuie was said to have almost died during the encounter, being injured several times as he dragged his body across. It is assumed that many soldiers drowned to death due to their heavy equipment. Common belief also states that Kenshin ordered a water attack of some sort to wipe out Katsuie's men.

Upon seeing Katsuie's battered troops, it is said Nobunaga became very angry with Kenshin. The popular opinion assumed Kenshin conquered Kaga Province after his victory and resumed his march towards the capital until his death. Matsunaga Hisahide was said to have used this battle to his advantage whilst opposing Nobunaga. A popular saying attributed to this battle is: "The Uesugi met the Oda at Tedorigawa. When Kenshin splashed into the river, his leap caused others to flee far away." The second part of the phrase is commonly interpreted as, "When Kenshin splashed into the river, Nobunaga jumped up and fled."