Pratu Khao Pluak Fortress played a significant role in Ayutthaya’s defence. The fortress walls have traces of crenellations where soldiers used to crouch during the battle and are now dilapidated. The arched entry doors of the fortress provided pedestrian access to the city. Wat Racha Praditsathan and Wat Tha Sai located respectively on the west and east bank of Khlong Pratu Khao Pluak, stand behind this fortress.