Sidwinding, in H.A.M is a special ability a fair amount of cards, mostly cavalry, have, where they take a step from where they are to the row above or below. They may not step into a space where there is a unit, and if they have 2 sidewind, they are still not able to sidewind over a unit, allied or otherwise. Sidewinding is useful for when you want to pick your targets, or if you want to take down other sidewinding units. A good way to prevent a unit from sidewinding is to place a unit both in front, on top, and below. Sidewinding can cause an easy victory when Sudden Death is in play.