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After the Ottoman took their dearly-won castle of Kruj', they rebuild the walls on the northern side, with openings for firearms, to make Kruj' as impregnable against the Albanians as it had been impregnable against themselves. The earthquake of 1617 caused the cracking and collapse of many hill structures, including the citadel, but in 1832, on the Sultan's orders, the Albanian feudal castles were made useless for defence and a centralised bureaucratic government replaced - at least in intention - the former feudal semi-autonomy of the mountain regions as Kruj'. Half-hearted attempts were made by the Turks to rebuild sections of the castle, after they have tightened their grip on the countryside, for they realised that sudden Balkan uprisings could overwhelm their government, and a defenceless castle is a doubtful asset to a ruling class.
sourse: http://www.albanian.com/information/countries/albania/kruja/index.html