 On 7December 1512, a detachment of the Navarrese army's decimated landsknechts who were escorting twelve artillery pieces when they encountered a patrol led by the governor of Gipuzkoa Juan de Silva at the Belate pass.The Gipuzkoan militia took on the landsknechts, who retreated in disarray, and were pursued and largely slaughtered.The skirmish was later exaggerated to a wholesale battle, with the cannons seized being added in 1513 to the official coat of arms of Gipuzkoa.