- Please post all quotes separately, so that they can be upvoted or downvoted separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
- Do not quote yourself.
- Do not quote from Less Wrong itself, HPMoR, Eliezer Yudkowsky, or Robin Hanson. If you'd like to revive an old quote from one of those sources, please do so here.
- No more than 5 quotes per person per monthly thread, please.
- Provide sufficient information (URL, title, date, page number, etc.) to enable a reader to find the place where you read the quote, or its original source if available. Do not quote with only a name.
I seem to recall, and a glance over the Wikipedia articles suggests, that the Mamluk and Janissary systems involved raising (enslaved) boys into a military environment from a fairly young age. These boys might come from subjugated territories, but they'd in effect have been part of the dominant culture for much of their lives: it's not a system that could be used to quickly convert conquered territories into additional manpower.
That said, it hasn't been unusual for empires, modern and otherwise, to make substantial use of auxiliary forces drawn from client states. The Roman military probably relied on them as much as they did on the legions, or more in the late empire.
The late Roman Empire wasn't exactly successful at conquering anything, or even at keeping the Empire from falling apart.