The Shinigami series, why chapter 3 has sensible term as 1st Army, 3rd Army, 7th Army, but in chapter 6 and 7, those "armies" become "platoons"? In page 26 of chapter 9, the enemy size at least a company, not a squad. In medieval era, an infantry regiment has 4 battalions with 600-1000 men each make total 4000 men, while a cavalry regiment is 1000 men, usually divided into two battalions or only as a single entity unit.