 The Franco-Navarrese held sway over an area extending from Belate to the mouth of the Bidasoa river.In May 1522, with Charles V in Pamplona, the Spanish forces started to gather the funds and troops necessary to respond.In July 1522, with Navarrese Amaiur about to fall, the Emperor disembarked in Santander with 4,000 landsknechts.