When he was only fifteen years old, he astonished his parents by announcing his intention to try for entrance to the École Polytechnique in Paris, a great training school for military officers. Such a plan seemed, not only to his parents, but to his many friends, much too ambitious for a barrel-maker's son. But he insisted on trying the examination and passed fourteenth in a class of one hundred and thirty-two. His sister, for whom Joffre always had a great affection, declared that he would have secured a higher rank if he had not passed such a poor examination in German, a language for which he evidently had a strong dislike. Those who have seen his examination papers say that they are models of neatness, clear thinking, and accuracy.

Because of his high standing, Joffre was made sergeant of his class at the École Polytechnique. This honor, which made him responsible for the order and behavior of his own classmates, was rather an embarrassing one, for he was not of a domineering nature, and was besides the youngest boy in the hall. He found great difficulty in exercising his authority over these dozen or so lively youths, though he was destined one day to be given command over more than three million men.

By hard work he made good progress in his studies. But he did not finish his course, for in 1870 the Franco-Prussian War broke out. Joffre, but eighteen years of age, was made a sub-lieutenant in a Paris fort. That terrible year left its impression upon him for life. He felt the greatest agony at the loss of beautiful Alsace-Lorraine—a part of his own beloved country, taken by the enemy. From that time he lived with one hope—that he might some day be of service in setting right that wrong, in getting back for France that which had been stolen from her. He once said, "I have seen 1870. I have given my life utterly to see that it did not happen again." Thus, it has been said: "The formula for Joffre is easy to find. It is a number; it is a date; it is 1870." What he saw at that time shaped his purposes for the future.

Joffre is not only a thinker, but a man of action. He thinks hard for a time, and then feels compelled to put his thoughts into action. The story is told of how Confucius, upon leaving a funeral service, presented his horse to the chief mourner. When asked why he did so, he replied, "I wept with that man and so I felt I ought to do something for him." Joffre thought long and hard and then wanted to do something.

After the war of 1870, he went into the engineering corps of the army and for fifteen years served well in building barracks and fortifications. Then he asked to go to Indo-China where France was waging a colonial war. He was commissioned a lieutenant, and at the end of three years returned a captain, with the Legion of Honor.

He was made a member of the staff of administration of the engineering corps, and while in this service it was said of him: "Joffre is good at all jobs. He will be good for the big job some day."

In 1892 he went to Africa to build a railroad. While working at that, news came that Colonel Bonnier and his party of Frenchmen had been attacked and many of them massacred by the natives near Timbuctoo. Joffre organized a rescuing expedition (which has ever since been held up as a model), took possession of Timbuctoo, and subdued the tribes; then went back and finished his railroad. When he returned to France this time he was a colonel, having risen one degree in the Legion of Honor.

After three years he was sent to Madagascar, where he built such excellent defenses that upon his return he was made head of the French military engineering corps. He then had the task of preparing the forts of France. He built the forts of Belfort, Épinal, Toul, and Verdun, all of which victoriously withstood the German attacks in the World War.

By this time, Joffre was a general. He practiced at handling troops in the field until he knew all the tactics in moving great bodies of men. He became chief of such matters as transportation, armament, and mobilization.

Yet all this time Joffre was almost entirely unknown among the French people. Quiet, almost shy, a man of few words, he was not one to call attention to himself. Only those who were close to him knew him and his great ability. Late in life he had married a widow with two beautiful daughters. He lived with them very quietly in Auteuil in the suburbs of Paris. Here the great chief loved to gather his family about the piano and enjoy their companionship and an evening of music. He could often be seen mornings, walking with his two beloved daughters. Always he was a kind, thoughtful, gentle, often silent man, and, being silent, he had also the virtue of being a good listener. For he hated empty words, though he talked long enough when he had something to say. He spoke with the greatest simplicity, however, and was always very gentle and courteous in his manners.