The overnight castle was an actual tactic used by the historical Nobunaga.
https://blog.gaijinpot.com/sunomata-castle-one-night-castle/
Built under Toyotomi Hideyoshi, his retainer, it was made as a launchpoint to attack the main castle of the opposing Saito feudal clan and gain their territory.
- Nobunaga was also called "the Fool" over his unconventional behaviour (for samurai nobility), like freely mingling with the lower classes.