No disagreement.
The Durants in their History of Civilization said that the Muslim (partial and never complete) conquest of India was the bloodiest episode in history.
Perhaps my favorite modern historical authors.
“For barbarism is always around civilization, amid it and beneath it, ready to engulf it by arms, or mass migration, or unchecked fertility. Barbarism is like the jungle; it never admits its defeat; it waits patiently for centuries to recover the territory it has lost.”
Profound writing.
Cheers