Sappers, fliers, engineers, Siege Golems...
Fliers also get bonuses, and there are units and commanders with siege bonuses (marked by an icon that looks like a catapult, IIRC). Sappers and engineers are examples of the latter. Some items also give siege bonuses to the commander carrying them, like Gate Cleavers and Wall Shakers.
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Are we insane yet? Are we insane yet? Aiiieeeeee...
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