This will be reflected in the Battle Cards by this "Charge Through" card:
Battle Card: Charge Through wrote:Cost: 1 pt per card (may purchase up to 2 such)
Play: reveal at start of game. Use during a friendly movement phase. A group of the designated mounted type may move through a group of the designated close-order foot type as if those foot were open order, on this turn only. The effect ends during the movement phase when a single group (or stand) has moved through as described; it has no impact upon fall-back or pass-through during the combat results phase of the same turn or on any subsequent turn.
This card is expended when played. Flip the card upside down (face down) when it is used, to mark it being expended for that battle.
Can we get some help finding armies (and mounted troop types) who would have this battle card? Please cite the battle where the event occurred; just saying "it seems reasonable to me" is insufficient documentation.