Another update brings a new unit and a new feature.
The unit - Child - acts as a cheaper "civilian" unit, which is less effective at hard works like lumbering and mining, but gathers fruit well. Boys have a bonus to carrying capacity, girls have a higher resistance.
As my grandfather always reminded me that Romans found it important to know how to read, write and swim, I always found it somewhat surprising, that in most Rome-themed games not even Velites can swim.
This is, of course, not acceptable for a light-infantry-focused faction. Thus, Warriors - both basic and skull-upgraded - are now able to swim. That is, they can traverse deep water with a small penalty to moving speed. A hack was needed in UnitAI component to make the specific animations for idle, moving and attack states.
"don't mind us, we're just having a bath"
Little update - now I understand how to calculate the depth, so the swimming mode should be triggered correctly.