Pretty much what Swabs said: Throw in some sacrificial units at an angle positioning hard hitting stuff around to engage them in the flank when they overun. Lance formation gives them long flanks so shouldnt be too tricky.
Steadfast/stubborn units would be good as if they dont break you on the charge they are mostly just S3 men with a 1 attack and a good save. Blessing of the lady gives them a 6+ ward save and a 5+ against S5 and higher so low strength but armour penetrating attacks like a salamanders breath weapon would be devasting. Kroxigors for getting through the armour be good too. Beware the trebuche, strength 5 nastiness, take it out quickly. The bowmen can have flaming attacks and defensive spikes which count as a fence in the new rules (I think)