That was due to the Islamic Arab conquerers changing their mentalities by force. The Zoroastrian Persians, however, had the mentality of free labor driven by respect rather then fear.Well, the Persians also made decisions of state while drunk, and didn't hesitate much at genocide, so they couldn't have been that nice. And even if you do care more about effectiveness than being evil, with all the invasions you have going on it seems ineffective not to take slaves.
I don't blame the Persians for the forced change of their personality by a Middle-Eastern invasion of Asia.
Speaking of Asia, the Persians are not the only people Tolkien was inspired by for Rhun, he also puts a bit of Chinese, Mongolian, and Korean inventiveness into them, and also he treats northern Rhun as Russia and Central Asia. And there is talk in the LotR prequel (Silmarillion) about the Last Desert being as Far East as one can go, and there was lore about Were-worms living there. So I made a map called "Asia as Rhun" that you can look at to see where I'm getting my logic.
Which means, for the sake of staying on-topic, any siege engines that any Asian culture had, maybe the Easterlings instinctively had.
That is all.
Edited by Nazgûl, 03 November 2010 - 07:45 PM.