Have you tried casting Haste on Armadillos?

When affected by Haste spell, Armadillos and Bellwether Armadillos walking animation changes to them curling into a ball and rolling across the battlefield. Armadillos and Bellwether Armadillos are level 3 creatures of Factory. They are recruited from the Ranch.

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Horn of the Abyss

How to install Heroes 3 Horn of the Abyss step-by-step

Hero Celestine the Artificer has Armadillos as a specialty, which increases the attack and defense skills of any Armadillos or Bellwether Armadillos for each level attained after 3rd level, and gives them a speed bonus of 1.