@BasicEden
Among the things Nobunaga is famous (or infamous) for:
- Usurping his own brother for dominance of Owari (his father's territory, and basically the first arc of this series),
- Betrayed by his subordinates, multiple times in some cases,
- Having a huge number of standing army in times where other daimyos conscript them from farmers,
- Fostering free trade; in particular, he's fond of tanegashima matchlocks (based on the ones used by Portuguese),
- Burning an entire temple complex along with everyone that moves. Admittedly, they were a thorn on his side, but still...
That battle you're talking about is the Battle of Nagashino, by the way. Look it up, it's fascinating.