Apart from a few retired soldiers who were skilled and competent, the rest who had never been in the military before was put through vigorous training by Sienna. Of course, excellent combat skills were necessary for mercenary corps. It was said that Sienna had already recruited a man at level-18 to work for him. Given Sienna's current abilities, the news should be reliable.
With Sienna's current abilities, he definitely had the means to monopolize all of the mercenary business given by the top factions. Regardless of the fact that Roland City was known for being one of the most developed cities in the Breezy Plains, the other mercenary regiments could only run errands and struggle as each day passed.