The PUC founded its Pedagogy School in 1943 and contracted Eyzaguirre to be in charge of the History of Chile classes. Most of the students of the time were priests, nuns and brothers. He was assisted by Mario Góngora is some classes. Apart from this part-time work Eyzaguirre was also part-time teacher at Liceo Alemán. At the Pedagogy School Eyzaguirre met Ricardo Krebs, who was also history teacher but had rather few contacts, and introduced him to the Catholic intellectual elite of Santiago. His salary is reported to have been low at PUC and when "raised" it mostly had to do with the currency inflation experienced in Chile. Nevertheless he was allowed to rent a small local owned by the Archbishopric of Santiago at a relatively low price. Here, Eyzaguirre ran a small bookshop called El Arbol until the late 1950s when it was closed. Despite his economic hardships he twice refused to be assigned ambassador to Spain. Eyzaguirre thought any diplomatic work he did would need to compete with his work as historian and therefore he would not be able to accomplish a dedicated work in diplomacy. At the same time the writings of Léon Bloy provided him with comfort about his economic hardship.
''O'Higgins'' and Spain
A milestone in the work of Eyzaguirre was his essay O'Higgins that won a prize in 1946 to commemorate the centenary of the death of Bernardo O'Higgins. This was the first written work that granted Eyzaguirre some income. The prize reward helped Eyzaguirre to finance a trip to Spain in 1947. This seven months long journey reinforced his leanings for Spanish heritage in his historiography. In Spain Eyzaguirry held a course on Chilean political and constitutional history at Universidad Central de Madrid. His stay in Spain made him target of attacks in Chile from those critical of Francoist Spain, in particular from people associated with the National Falange party. Personally, Eyzaguirre admired the stoic stance of the isolated Francoist Spain against both Soviet and Western pressure but did never propagandize for Francoist Spain in Chile.
Back in Chile
For a time he was teacher of Jaime Guzmán. When the journal Historia was established in 1961 Eyzaguirre served as its first director. Generally Eyzaguirre dealt with similar topics as Lewis Hanke. He despised 19th century writers such as José Victorino Lastarria and Domingo Faustino Sarmiento because he considered they "ruptured" the historical links to Spain and characterized their views as "apostasy". The work of Eyzaguirre was criticized by left-wing historians. Mario Céspedes said in reference to Eyzaguirre's writings on the conquest of Chile that the conquest was a search for indian labourers and "not a chivalrous journey". On the essayO'Higgins Céspedes wrote that it lacked "the social and economic causes of the facts". Marxist Julio César Jobet made a more harsh criticism accusing Eyzaguirre of "exalting backward doctrines and institutions" and undermining the influence of "French rationalist and critical thought in the development and progress of Chile".
