(1) Completed works:

Pamphlet (printed in 1868 but not intended for sale), which forms
the first part of the present edition: Ancient Battle.

A series of memoirs and studies written in 1865. These are partly
reproduced in Appendices I and II herein.

(2) Notes jotted down on paper, sometimes developed into complete
chapters not requiring additions or revision, but sometimes
abridged and drawn up in haste. They reveal a brain completely
filled with its subject, perpetually working, noting a trait in a
rapid phrase, in a vibrating paragraph, in observations and
recollections that a future revision was to compile, unite and
complete.

The collection of these notes forms the second part: Modern Battle.

These notes were inspired by certain studies or memoirs which are
presented in Appendices I-V, and a Study on Combat, with which the
Colonel was occupied, and of which we gave a sketch at the end of
the pamphlet of 1868. He himself started research among the
officers of his acquaintance, superiors, equals or subordinates,
who had served in war. This occupied a great part of his life.

In order to collect from these officers, without change or
misrepresentation, statements of their experiences while leading their
men in battle or in their divers contacts with the enemy, he sent to
each one a questionnaire, in the form of a circular. The reproduction