A Treatise on the Tactical Use of the Three Arms: Infantry, Artillery, and Cavalry is a classic military strategy study by Francis J. Lippitt. Every complete military force consists of three arms, --Infantry, Artillery, and Cavalry.In battle, these three arms are united; and, other things being equal, that commander will prove victorious who is best acquainted with their combined use in the field.In order thoroughly to understand the proper use of the three arms combined, we must obviously begin by learning the proper use of each of them separately.