De första stegen mot grundandet av Lunds universitet - Tåget över Bälten.

The Swedish army marched 1658 over the ice on the Danish sounds from Jutland to Zealand. An event that led to the foundation of Lund University in 1666. From the loads involved the ice thickness can be determined to have been at least 20 cm. Using data from mid-17 hundreds and forward the ice thickness of every year is computed. Large ice thickness seems to have been more common in the period mid 17 hundreds to mid-18 hundreds than for the next 100 year period. The computations are repeated assuming colder temperatures in the 16 hundreds than for the period 1760–1860. While the probability that the ice today is 20 cm a certain year is very low, the probability in the 17th century should have been somewhat less than 20 %.