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> camp followers
The armies of the steppe people did not have camp followers. They would have slow the going down (just how their families would have if they were with them on campaigns). The "train" was the spare horses who served as fresh saddle horses, arrow haulers (they brought massive amount of arrows, there's data how much the Parthians used at Carrhae, another homework for you to find it), loot haulers, and occasionally if need be, walking foodsource. During battles they left behind comparatively few men who could herd the whole thing. A stationary camp with families would have been extremely vulnerable even to a small amount of enemy horsemen (enemy steppe people) and would have distracted larger amount of warriors to guard them, probably in vain.