The town was sacked in <answer>13</answer>38 by French, Genoese and Monegasque ships (under Charles Grimaldi, who used the plunder to help found the principality of Monaco). On visiting Southampton in <answer>13</answer>39, Edward III ordered that walls be built to 'close the town'. The extensive rebuilding—part of the walls dates from 1175—culminated in the completion of the western walls in <answer>13</answer>80. Roughly half of the walls, <answer>13</answer> of the original towers, and six gates survive.
How many of the original towers from Southampton's walls are still standing?
13