A lecture give by 1st Lt. Douglas MacArthur in 1908. This lecture was delivered to the Mounted Service School, Fort Riley, KS in November 1908; the Staff College, Fort Leavenworth, KS, in December 1908; and the School of the Line, Fort Leavenworth, KS, January 1909. "This paper is intended to deal with the subject of military demolitions only in its relation to the work of tactical troops, mainly the infantry and cavalry, and omits all treatment of more systematic and extensive operations of technical troops along the same line.