When should I use Wedge Formation? It seems very ineffective, since cavalry tend to just slam their breaks as soon at the first unit hits the enemy. I tend to line up my cavalry in 3 rows, parallel to the enemy, that way all of the front row reaches the unit at the same time, and if I'm lucky the second and third row may keep charging.
I haven't tried the wedge, for fear of it screwing up, but it shouldn't take much reasoning to assume that the wedge is just too ineffective.