The book is devoted to the study of the complex of military means on the lands of the Grand Duchy of Lithuania in the second half of the XIV-XVI centuries, its dynamics and influence on the allocation of military branches. The range of protective weapons, melee and ranged weapons, equipments of the rider and the riding horse are analyzed separately. Attention is drawn to the level of provision of weapons to various categories of soldiers, depending on their viability and regional specifics. The author uses a wide range of visual, material and written sources. The book is richly illustrated.