What rank would he hold?


For a laugh a friend and me are working on A Legends/Harry Potter cross-over based around Harrys 6th and 7th years at Hogwarts, as they where in my RPG's from 13 years ago and not as they are in books

Could you please tell me what rank The Supreme Commander of Voldemort's Forces would hold when she/Bellatrix Lestrange, who in my RPG's was magically given 40 years of training, knowledge, first-hand learning and experance in a mere 10 months thanks to A Device Voldemort had made, commands 22 Regiments each of which are 1,175 men strong?. Please
Military Rank? Supreme Commander.

Legend Rank? Hero. It isn't on the list of Ranks, but you just add an extra level.