Rubuta ci gaba ga wannan sakin layi - Goicoechea ya rubuta Iron Belt don kare Bilbao a lokacin yakin basasar Spain. Amma ba da daɗewa ba kafin ya gama shi sai ya koma bangaren Nationalist, kuma wannan ya kasance mai yanke hukunci a cikin Nationalists da ke cin Bilbao
a ranar 12 ga Yuni, 1937.