The Army Management screen is where we build our army. As the game progresses, we'll collect a roster of regular and veteran
units. Right now, we've limited unit types available, but a few victories will quickly improve our options .
Units have costs assigned to them and, initially, we have a limited budget to spend. Let's use this now to create our starting army.
We simply drag a unit from our roster to add it to our army. Once we're done, we can save the army setup so we can
keep it for future battles.