Sieges were common in sengoku jidai Japan, but not siege battles. Castles were only sometimes stormed by the enemy troops. More often the defender retreated, sallied out or waited for reeinforcements. Off course the lack of siege weapons played an important role, because castles were easy to defend, without them.
Decisive battle were a daimyo used all his troops were the least common form of combat until Oda Nobunga took over and the battles became a new scale. Still many battles were rather skirmishing fights with lots of duels and not meant to cause huge losses like for example the battles between the takeda and uesugi.
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