The fortified city temporarily fell to the French invasion in 1672 (the Disaster Year); where the French invasion was only stopped west of Utrecht at the Old Hollandic Waterline. In 1674, only two years after the French left, the centre of Utrecht was struck by a tornado. The halt to building before construction of flying buttresses in the 15th century now proved to be the undoing of the central section of the cathedral of St Martin church which collapsed; creating the current Dom square between the tower and choir. In 1713, Utrecht hosted one of the first international peace negotiations when the Treaty of Utrecht settled the War of the Spanish Succession. Since 1723 Utrecht became the centre of the non-Roman Old Catholic Churches in the world. COUNT 5
QSN1 Who did the fortified city fall to in 1672  ANS1 temporarily fell to the French invasion in 1672 (the Disaster Year); where the French invasion was only stopped west of Utrecht QSN2 In 1674 what hit Utrecht  ANS2 the centre of Utrecht was struck by a tornado QSN3 What collapsed during the tornado  ANS3 The halt to building before construction of flying buttresses in the 15th century now proved to be the undoing of the central section of the cathedral QSN4 What did Utrecht host in 1713  ANS4 In 1713, Utrecht hosted one of the first international peace negotiations when the Treaty of Utrecht settled the War of the Spanish Succession QSN5 Since 1723 what has Utrecht become  ANS5 Utrecht became the centre of the non-Roman Old Catholic Churches in the world