Formations currently order units in this order : <SortingClasses>Hero Champion Cavalry Melee Ranged</SortingClasses>
Where Cavalry get to be often in front of Infantry melee, even when they are ranged units, like archers or javelin cavs (but not always, they seems to sometimes get behind as "Ranged" too).
I'm pretty sure most players of any levels, would prefer to have ranged cavalry behind melee infantry. And even costly units like hero and champion, not on the first line.
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