When you select an army, do you see the red area around an enemy army? Move your army/ies there and attack with your main force, and voíla the armies in the red area will appear as reinforcements. The only problem is that the AI generals isn't smarter than a stone and therefore make a glorius charge to death .

What I want to know is if there's a way to make the reinforcements not reinforcements, so to say? I would like them to be included in my main force so I can use them properly.