Restored to Prussia in 1816 it was again fortified, but in 1862 the fortifications were converted into a public park.
Possibly these slight fortifications preserved the capital from the destruction which overwhelmed all the other settlements; but these measures for defence were due more to the loyalty of the inhabitants than to the efforts of the home government, which at this time remained indifferent to appeals for help from the island.
The English attacked the island in 1678, 1702, 1703 and 1743; and in 1797 an English force attempted to reduce San Juan, but was repulsed by the strong fortifications vigorously manned by resident volunteers.
Its fortifications, though not increased, were apparently strengthened by the Tyrants.
The Phaleric wall, branching from the city circuit at some point farther east than the middle or south wall, may have followed the ridge of the Sikelia heights, where some traces of fortifications remain, and then traversed the Phalerum plain till it reached the Peiraeus defences at a point a little to the north-west of their junction with the middle wall..