The siege of Miletus was a fairly normal technique during this time. For landlocked cities such a siege would normally involve surrounding the city with troops or constructing a wall around the cities perimeter. If a city had access to the sea then a siege wall had to be supplemented by a naval blockade. Sieges were very expensive because of the large number of troops needed. This map shows Miletus was on the water so tpanionmp2.GIFhe Persians had to use a naval blockade as mentioned in the text.