... time on the staff of Kellen, and afterwards in the office of the Secretary of War. In 1805 he received an appointment on the staff of Marshal Ney, with whom he passed through the campaigns of Cim, Jena , Eylau, and Spain, and was promoted to the rank of chief of staff for services in the field. In these campaigns he acquired a brilliant reputation as a staff officer and a strategist, but his s...