sentences:  In a few weeks the cold had grown so intense that the freezing of an arm of the sea with so rapid a current as the Small Belt became a conceivable possibility; and henceforth meteorological observations formed an essential part of the strategy of the Swedes.On 28 January 1658, Charles X arrived at Haderslev in South Jutland.His meteorologists estimated that in a couple of days the ice of the Little Belt would become firm enough to bear even the passage of a mail-clad host.