The 13th and early 14th century was a time when Lithuania emerged as a grand duchy and became one of the biggest expansion forces in northeast Europe. Unfortunately, we have no information today about what the equipment of a Lithuanian warrior looked like at that time, except for archaeological data and poor historical sources. The aim of this article is to show that by using this apparently quite scanty information, we can create not only an image of the arms and armour used by a particular warrior; there is also a possibility to retrace specific features of warfare by Lithuanians. The search for analogues should not be limited to archaeology. Much information can be obtained from sources in the fine arts and applied arts. The analysis of Medieval art can be as important as research into weapons itself, because an archaeologically discovered object can easily be recognised in fine arts sources. However, this information should be analysed carefully, taking into account certain factors (the special conditions of Medieval art) that may cause the study to go in the wrong direction.