War is a function of the world environment and its turbulence, philosophy believes. The nature of any function in society presupposes an activity that must be performed. War is an activity of a special nature associated with the use of various types of weapons by professionals and others. Professionals and others pursue certain goals, the achievement of which has become impossible through peaceful means, and war becomes the only means of resolving the emerging contradictions. By opening this book, the reader will learn how to prepare for war from the point of view of the philosophy of war, which includes a religious component. This approach makes it possible to define the concept of a just and holy war, war as the defense of the state and people, man and his right to comradeship and friendship, as values leading to love and forgiveness. The publishing layout of the book is saved in PDF A4 format.