 Complete the following phrase:  Joseph Joffre was Commander-in-Chief, a position for which he had been designated since 1911. While serving in this position, Joffre was responsible for development of the Plan XVII the mobilisation and concentration plan for the offensive strategy against Germany, which proved a costly failure. Joffre was thought to be the Savior of France due to his serenity and a refusal to admit defeat, valuable at the beginning of the war, along with his regrouping of retreating Allied forces at the 