I have yet to try it, but it does make sense against the AI.

I think there was a post about how you could make heavy cavalry win against spears from the front, it was basically the same.

In MP if you see it is about to be done to your spears you can either:

a) Wedge them... or
b) Put them in Engage.

If you put them in Engage you have a better change of breaking ranks, as well as the men on the flanks will engage the flankers more aggressively.

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BTW, Danish Crusades are true to history.

You may not care about war, but war cares about you!