In today's modern society western countries have adopted a regular doctrine for future wars, even though an irregular method have been proven effective against the modern regular army. Due to a balance between the superpowers the doctrines stay the same, but for smaller nations the balance is of lesser importance. The aim of this thesis is to shine light on the problem, and try to give argu-ments for a discussion about how Sweden and other smaller nations can use irregular warfare in order to defend themselves against bigger nations. In order to do that this thesis will investigate how revolutionary guerrilla warfare theory can be applied on international conflicts. Guerilla warfare is the tactic of choice primarily since history show that small numbers can win against overwhelming-ming odds. By Using Robert Tabers theory about successful guerilla warfare, this thesis will compare the war in Vietnam and the second Boer war in order to see how Tabers theory was used or not. The research shows that Tabers theory indeed was used in both conflicts and can somewhat be used to describe the outcome of each conflict.