Ok, this manga just lost 2 points in my score just in the past two chapters, quickly introducing fire weapons is a huge plothole. Guns are hard to make. Even the barrel is hard to make without modern techniques that didn't exist in medieval times. There are many small parts, and if things aren't very precise, the gun will shoot in a random direction. That's why in drifters, despite nobunaga knowing how to make guns and gunpowder, he required the skilled Dwarves to make the guns for him. Besides, the only clear advantage of muskets to bows is the easiness to master the weapon. But in a fight with equal numbers and terrain, it wouldn't mean any advantage at all, bows would be better.
Yes, I know, using armors like that would make bows useless because they are too heavy, but crossbows can pierce armor too. The armor can't be too thick, or else it gets too heavy, it may resist simple arrows, but a crossbow bolt has much more knetic energy than an arrow. Fighting two lines is also far from ideal in this situation. He was using most of his dolls to block the enemy while he fired, which means, the crouched line would hit his own soldiers. The best he could do is to make everybody crouch and one line shoot over the head of his doll on the enemy. Bullets don't make curve. And even so the enemy could just crouch too to hide behind the defending dools.
Strategy and tatics are something hard to pull right if you don't research a lot of it. Try playing Medieval Total War 2, you gonna learn a lot of how to not fight.
This chapter is completely unbelievable, just a waste of time. And the previous one as well. Having ambition isn't bad by itself, but depending on the methods it's bad as a whole. Giving him a chance to keep his life gonna just encourage others to betray her as well. It's impossible to fight battles against an enemy while looking at the back.