 The vulnerability of these earlier forts, hostilities with the French and the growing might of the Company resulted in stronger and more complex designs for the second round of construction, the design of Fort St George reflecting the influences of the French engineer Vauban.Although no Indian forts were destroyed by sudden disasters, there are several which were abandoned due to the ambitions of their rulers and have consequently deteriorated over time.Very few castles have survived unchanged since the early Middle Ages or even since the 14th-15th centuries