Alfred Thayer Mahan and Julian Stafford Corbett, two of the most influential and important strategists of sea power in the beginning of the twentieth century. Their theories today form the basis for several of the theories of sea power that exist today. The societal changes have led to the development of the naval warfare´s character until today. Despite developments in the history of naval warfare and it´s characteristics over the century there are being debated about the principles of sea power that Mahan and Corbett wrote might still be valid or not. The aim of this essay is to investigate whether Mahan and Corbetts principles of sea power during the Falklands war as a case study might still be valid or not. The examination is carried out by analysing Mahan and Corbetts principles of blockade, establish of sea command and exercise of sea command respectively to extract variables in the theory and examine on the case Falklands war. The results of this case study shows that the theories military blockade, naval blockade and establish of sea command are still valid to a certain extent but more research is needed to determine the principles general validity in the naval warfare today.