In this conflict, unusually, the Romans chose not to take prisoners. Moreover, there was a tradition among the Cantabri of preferring suicide to slavery. They did this by sword, by fire, or, primarily, by poisoning themselves with potions made for the purpose. According to Silius Italicus they used a concoction made from the seeds of the yew tree, a plant with mythic significance for the Celts. Strabo said that they belittled death and pain, to the point of singing hymns of victory while being crucified. For them, according to Strabo, to die as soldiers and free men was a victory.