i did that in a small tourny, 4 units of 5 knights, 3 charriots and some heroes
versus mid tiers and lower armies is very powerful, i even won vs daughters of khaine,
versus top tier, like fyreslayers, is auto loss, no way of taking objectives , your unit will bounce.
against heartguard for example the only way is varaguanrd or somehow snipe the heroes giving the buffs