A militia spear unit seven files wide by 11 ranks deep whips a unit of mailed knights, although they have to charge while the cavalry's approaching and keep attacking after they withdraw to form up for another charge.
That's much more micro than anybody wants to spend with a spear unit, but it can be done. Perhaps the trick would be to have two spear units in a shallower formation up front and a third, deeper formation in reserve.
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