 At the Battle of Ravenna in 1512, they proved to be very effective with this tactic; however, when facing a fresh, well ordered pike square, they were vulnerable, as at the Battle of Seminara.They were also very vulnerable to attack by cavalry.As battlefield tactics evolved during the early 16th century, the Spanish ultimately concluded that the vulnerability of the rodeleros on the battlefield outweighed their strengths, and they were dropped as a troop type when the Spanish infantry were reorganized into tercios in the 1530s.