The term slave militia is a bad one to use. Travian you can do better. Using the slave is akin to using the nazi. Completely unacceptable.
However, most of these were not the slaves as we know the term: involuntarily driven to exhaustion, and payment was only food and water.
Egyptian noble families and shrines to the Gods actually had voluntary slaves and even paid slaves, but the slaves were the ones paying the copper to the slave drivers, not the other way around.
There were even slave contracts.
In other occasions, farmers or other citizens were forced to go into service due to poverty.
Where banks would now foreclose your house, they had to serve the landlord to earn their keep.
Mostly because back then you had to build your own house, and buying another man's house was not practiced: That house would stay in the family.
So the only thing to start taxing was the land they lived on.
Making the jump from slave to nazi is actually really far-fetched.
Mod/MH/SH (aug 2007 - feb 2010) // MH (sept 2015)