Yes, I'm close to one other scholar of Deoband, senior, he teaches there and he once explained this to us quite beautifully, unlike how its been done so in rise and fall of Muslims. My suggestion then is 'Don't read this book: The rise and fall of Muslims' at least not for laymen like me. Apart from that, bro do you know, Allamah Qamruddin Saheb db (though, he is not the scholar who explained)