These towers were innovative, their unrivaled advance allowed a better coverage of the walls, leaving no blind spots without defensive coverage. Its faceted and massive prismatic shape better resisted the impact of the bombardment. The slope of its bases made it difficult to use the arlete and prevented the mining of the foundations. The main creator of these military techniques was the Italian Francesco di Giorgio Martini (1439-1501), who made them known through his treaties, and in the success of building new fortresses with these new techniques.