Historically, the Sindh region suffered frequent invasions.
Those Oriental influences stemmed from a large border shared by Poland with the Ottoman Empire, and it frequent invasions.
It is likely that the towers had defensive functions, because in the 10th century there were frequent invasions on behalf of the Magyars into Tuscany.
The equals of the grand temples of South India do not find in North and Central India, (which was comparatively free of frequent foreign invasions).
The Roman period of relative prosperity was substituted by one of insecurity caused primarily by frequent invasions, outbreaks of plague, cholera, and malaria.
Both Kingdoms were weakened by frequent Safavid invasions.
Joseon's centralised government and the need to fend off frequent foreign invasions were conducive to the development of swordsmanship as a standardised military discipline.
From 227 onwards, he was very much involved with successfully repelling the frequent invasions led by Zhuge Liang.
As such, it became a major base for the frequent Muslim invasions and raids into Byzantine territories, and was often targeted by the Byzantines in return.
Like the surrounding Balkan countries, Bosnia and Herzegovina has had a turbulent past marked by frequent foreign invasions and occupation.