A problem with creating an army

[scutarilegion]

I started playing this game, and I've done most of the quests so far. Now I've come across a quest that requires me to create an army in the world map, that has livestock in it. But when I open the army creator in the world map, I can only find the soldier tab, and the only unit there is 1 of the heroes I have. So I cannot add soldiers, peasants or livestock in the army at all.

Here's an image of the army creator.


And here's an image of my city, to proof that I have units and livestock.