Let's talk about khalid

>>3162662
>when he's actually very inexperienced in the warfare?
He wasn't inexperienced. Even before the war against the Byzantine and Sassanid empires Khalid had experienced tens of battles in the Ridda wars and war against Muhammad when he was a Pagan.

>>3162662
that tv series is top notch

First of all, he wasn't inexperienced. Before he fought against Persians and Romans he participiated in battles against other Arab tribes and Muhammad himself.
Second, this is what we call a military genius. He didn't graduate from a military college, he never read a book about strategies, he just naturally developed his strategies.

It isn't like the Arabs didn't know their enemies. Arab warriors were clients and mercenaries to the Romans and Persians for centuries before they united.