How skilled was he really? Looking at wikipedia, over his entire career, I'm a bit surprised over his so good reputation as general. In most of his battles where the troop numbers are explicitly given, he has 2:1 superiority or more. In the other battles, his opponent is usually a minor clan, so we may assume that there again he would have vastly superior number in most cases. Additionally, some of what are attributed to him as his "greatest battle victories" are just things like 30,000 soldiers carrying out a massacre of 20,000 monks and civilians (Mount Hiei, for example) - questionable if it at all should be called a battle, and plenty of the other battle victories have numbers such as 40,000 Oda forces vs 15,000 opponents and so on (with the 15,000 additionally being worn down by having sieged a castle for a long time, while the 40,000 were completely fresh). He also suffers defeat repeatedly even when he has 3:2 or 2:1 superiority in numbers on his side. So why his good reputation?
His only truly remarkable victory, considering numbers, according to my reading, is the Battle at Okehazama, where his 3,000 men were victorious against 25,000 men. However, it appears that essentially his opponent was drunk beyond reason, not carrying their weapons ready, not expecting an attack, and believing they had already won the campaign. They were celebrating, singing, dancing, and drinking at the time. Oda led his 3,000 men in a surprise attack onto the camp where these 25,000 drunk and unprepared men were staying, while putting a few banners on a hill on the opposite side, so the drunk men would think they were surrounded by a large force, and in their drunk state would just run away instead of fighting. Oda thus went into the camp and slaughtered the drunk or sleeping troops that couldn't get away. Admittedly a good plan showing great understanding of how drunk opponents and officers behave in battle, but apart from this incident, I can't really find a single reference to any sense of ingenuity in Oda's warfare, or any amazing victory at all against troops that were reasonably sober.
Yet, after the battle at Okehazama, Oda gained (perhaps undeserved?) great reputation enough to win many to his side (among others Tokugawa Ieasy). Once he got many skilled officers to his side, and enough troops to always have superiority in numbers, he could obviously gain more victories rather easily (couldn't anyone have, with such numbers on his side, as long as he wouldn't be drunk?), even though he seems to have been a less skilled commander than most enemies he later met in battle (according to the figures for the battles given by wikipedia). With more victories - even though these were unqualified successes based on extreme superiority in numbers - his reputation would of course improve even more. With constantly superior numbers and better generals, the following victories aren't very surprising - rather, what is more surprising is his many defeats even when he has superiority in numbers, considering what advantages he seems to have had. Anyway, whether victorious out of unqualified success or skill, he would be the warlord most soldiers would prefer to serve under after his early history of victorious, since they would get the same pay as from any other, but with greater chances of pillaging and less risk of death, due to the history of victories (whether unqualified or not). Thus, a positive feedback circle is created: he has a history of (unqualified) victories, and thus he gains resources that even an averagely competent commander would be unable to not gain victory with.
So, maybe it's possible to say that the battle of Okehazama decided the entire history of the Sengoku period, by creating the false reputation of Oda as a more skilled commander than he was, thus giving him the prerequisites for future (unqualified) successes?
Examples:
http://en.wikipedia.org/wiki/Siege_o...yama_Hongan-ji
Oda 30,000 vs 15,000, enemy surrenders castle - unsurprising victory
http://en.wikipedia.org/wiki/Siege_of_Mount_Hiei
30,000 Oda warriors slaughter 20,000 monks and civilians - unsurprising victory, was it even a battle?
http://en.wikipedia.org/wiki/Battle_of_Nagashino
38,000 Oda vs 15,000 enemies - unsurprising victory
http://en.wikipedia.org/wiki/Battle_of_Tedorigawa
50,000 Oda troops defeated by Uesugi Kenshin's 30,000
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