So I did run a manhunter's scenario.
The start is rough, to be sure. There were universally 2 jobs offered to me at the spawn city. Kill a nomad camp and kill some beasties. Given how reliably you can get a free indebted from every single battle against humans it might seem tempting to go after the camp, but Im convinced its a trap. At least on expert it is not worth it. Nomads are stronger than thugs, and even a group of 7 thugs require some morale swings to make it through with 0-1 loss of man.
To start with, buying some basic armor for the indebted seems like the winning go. A pitchfork for the one you probably cant afford to cloth on hard economic difficulty. The added survivability is just a little more important than getting better weapons for the slaves.
The beasts can be killed, with some luck, without lose. Then you hightail it out into the desert to lure nomads back toward patrols from the city or you go north to pick on weaker thugs. I kept buying better armor for my slaves, progressing from cloth to eventually leather padded by day 20.
The whip ability is pretty strong.
+10 melee and ranged skill
+3 defense
Reset morale to nuetral
Improved initiative
Thats a lot of buff. +10 to spearwall rolls are fantastic. Not every indebted crap rolls the matk either. +10 to mace stunning is good too. So is +10 to disarm rolls or archery. You get the idea.
+3 defense is nice, but only situationally worth using as a defense buff instead of as an attack buff. I was able to make good use of whip to beat 3 serpents. Serpents are usually a hard nope for me when Im in Early Game.
As for later on, Im in mid game now, and we're doing -okay- against outlaws and raiders. We take heavy hits, both due to the low hp of my indebted and the lighter armor we have because we have so many people, but having more men on the field and being able to selectively buff your men helps a lot. Ive decided to put my real bros into the back line, one as a maceman, one as the standard bearer, and one as a whip/polehammer quick hands. My favorite indebted is a barbarian thrall we took who uses an axe, my second is a caravan hand we took early on who quickhands a clutch of spears, a hammer, and a few fire lances.
Its slow leveling for everyone, because we have so many brothers and so many of them die and gain xp so slowly, but 4 out of the original 6 are still alive. With 3 actual bros I only pay out 42 gold a day, its a pittance. I find myself hanging on to only 150 or so crowns; Thats a crazy amount of poverty I can afford. A single caravan raid can sustain me for several days since food is the bottleneck resource,