This publication, made up of the five small notebooks, was written by a schoolboy, and kept day by day between 1914 and 1918. They are written by a child of rare maturity, and carefully preserved by him, who was later to become one of the major theologians at time of the Second Vatican Council. This is the origin of a rather unusual book—diaries by children are rare!—that strictly respects the original manuscript with it drawings in coloured pencils, and even retaining the original grammatical and spelling errors. Yves Congar, the future Cardinal Congar, was only ten years old when the First World War broke out. Congar was born and raised in Sedan, in the Ardenn region of France, where there were many bitter memories of the defeat during the 1870 Franco-Prussian War. This book, therefore, is a particularly moving form of patriotism written at the time of the German occupation from 1914.