sentences:  These include the explicit theories about military life espoused by Alfred de Vigny, who advanced a theory about "the monk of war", and Hubert Lyautey.Nick also observes the implicit attitudes toward military life of those in his unit.That of commanding officer, Rowland Gwatkin, is derived in part from A Song to Mithras from "Puck of Pook's Hill", and from Gwatkin's reflections on former military heroes such as Owain Glyndŵr.