I second Garry’s answer. Nothing more to add to it except that you should remember that all units that are in a position to support will be affected. This is regardless of whether they were used as support or not.
as you know, only three units can support a unit in combat, but there could be more than three units in a position of support. it illustrates how dangerous a break test failure can be and the possible domino effect it can have on your brigade.
