The 1986 Joint Staff Officer’s Guide, AFCS Pub 1, identifies seven military mission options available to national leaders as possible solutions to deal with international problems. Of these seven options, two specifically involve the use of a naval blockade or quarantine. This study uses historical analysis to derive factors which merit consideration by political and military planners contemplating the employment of a naval blockade as a possible option. The study identifies characteristics which have contributed to the success of past naval blockades and focuses on characteristics that have been common to most successful applications of the naval blockade. The study analyzes 41 blockades or periods of blockades occurring between 425 B.C. and 1973. The study reviews these blockades in three distinct time periods: prior to 1600, during the age of sail from 1600 to 1860, and during the age of iron steel from 1866 to 1973. Additionally, two other blockades are reviewed in detail. These include the blockade of the South during the American Civil War and the blockade of Cuba during the Cuban Missile Crisis. The study identifies 22 characteristics which were common to most blockades. The study also reveals 23 secondary characteristics which were also found to contribute to the success of blockades. Two factors were found to be utilized in virtually all successful blockades. The first of these two characteristics was the use of superior sea power by the blockading forces. The second of these characteristics was the use of operations ashore in conjunction with the blockade. These operations took the form of an invasion by ground forces, air strike, land campaign or the imminent threat that one of these operations might be used successfully. The study also includes a review of potential future trends in operations.