A horde of Mongols is heading to Kintoki castle to plunder it and kill the Japanese inside.  If they want to survive, the Toibarai and exiles will have to put aside their differences and fight.
So that's how their stone-throwers work.
إذاً هكذا هي آلية عمل قاذفات الحجارة خاصتهم
So funktionieren also
die Steinewerfer.
Je vois. C’est donc ainsi
que fonctionne cet engin.
Capisco. Ecco come funzionano le loro catapulte.
Então é assim que as 
lançadoras de pedra trabalham.
Ясно, вот как действуют камнемёты.