true, even in RTW, cavalry could punch through formations. It looked disastrous and I thought that the unit was dead, but in fact they did not suffer many casualties and completely wiped out the cavalry force. The cavalry did ruin their formation, though, and allowed other infantry to begin killing that unit. The square formation ideally has a similar effect, as well as being similar to the schiltrom formation in m2 and rtw BI, which was rather cumbersome but protected all flanks of that unit.