45:00
Qin was prepping to invade Wei, but Wei attacked first from my understanding. Qin is still technically the invaders, since they captured the Wei city they were after
51:46
these are the first few ranks:
corporal (5-man)
squadron (100- to 200-man)
company (300-man)
battalion (1000-man)
excluding the first one, each of these are led by a commander of that rank, alongside commanders who are their lieutenants/assistants. "lieutenant" is less of a rank on its own and more of a position inside of each of these units. Bi is a battalion commander, but also acting as a lieutenant to a larger army