Can someone please explain how roll for defense and determine casualties when conducting an area attack with either artillery or mortar fire? When there are multiple units in an area are your shots equally distributed? Does each unit get to roll for defense? If you are attempting to pin units, and you score two hits are all units subsequently pinned? Just some clarification please.

here is an example let say the defender has 3 squads in a woods hex. the attacker fires a normal attack with a double mortar squad (4 fire power) and scores 2 hits all the 3 squads take 2 hits each as it stands but the defender now rolls defence dice for each squad (2 defence for woods) eg squad 1 rolls their 2 defence dice, squad 2 rolls theirs etc

the same deal with supressive fire so it is possible for some squads not to take hits or become pinned while other squads may depending what the result of each of their defence rolls are