Skilled forces > Taking skilled forces as captives

You can in your campaign take other players skilled workers (skilled forces) as captives. 
To do this you should provide the following conditions
1- Your campaign type should be looting (Raid)  
2- All the resources have been looted in the defender’s city, and the warehouses are empty.
3- Your army should have at least 1000 units of resource carrying capacity. For example, 20 infantry which each has 50 units of resource carrying capacity would equal 1000 units.

Each captive skilled force will add 100 points to your looting score.