Use the console to enter the following

create_unit "settlement or character" "unit ID" "amount (1-5)" "experience (1-9)" "armor (1-3)" "weapon (1-3)"

Example:

creat_unit "London" Longbowmen 2 9 3 3

The above code will create 2 units of Longbowmen in London with 3 Gold Chevrons, Level 3 armor and Level 3 weapon.