Description:This is an examination of the information available about a number of fortified sites in Attica with a focus on 1960 excavations at the site of Koroni on the east coast of the Attic peninsula near Porto Raphti. The corpus of all known sites includes original site maps and plans, as well as much previously unpublished information collected during topographic investigations by the author. Many of the sites surveyed were established around 325-250 B.C. in the uncertain times following Alexander the Great's death, especially during the Chremonidean War when Ptolemaic forces were active in the region. The author traces their later history, extending his description of military encampments around Athens up to the present day.