Kyoaku Gakuen - Vol. 2 Ch. 7 - The Battle of the School Gate of Death

[MangaDex]

 

[CorakTM]

I don't know about the other guys, but Takkeida Ingen is this guy: https://en.wikipedia.org/wiki/Takeda_Shingen

 

[teriguu]

The castle mentioned is just a ruin these days.

 

[Gespenst]

Wang pa-tang is a Chinese curse word, that is roughly translated to bastard in English.