From the Danish side, Dahlbergh carried out careful investigations of the ice. On 2 February, Danish cavalrymen fleeing Funen arrived at the fortified town of Nakskov on Lolland, reporting they spotted a Swedish patrol on Langeland. The next day, Nakskov's commander received news that Swedish troops were inspecting the ice condition from Langeland to Lolland. Dahlbergh received his order from Charles X Gustav on 31 January, and escorted by 200 Finnish cavalrymen under Colonel Claes Uggla, Dahlbergh crossed two ice-covered straits and reached Longelse church on Langeland on 2 February, from his starting point on Funen. There, Uggla regrouped with the main part of the cavalry, while Dahlbergh and 40 cavalrymen under Niethoff crossed the wide Great Belt and arrived ashore at Grimstedt's mansion. The Danish coastguard of a dozen horsemen withdrew, but one of them was captured along with two farmers: Dahlbergh transported the prisoners across the Great Belt as living proof of their crossing. On the way back, Dahlbergh took several drill samples of the ice at Rudkøbing on Langeland and inspected a Swedish unit on Ærø. On the evening of 4 February, while the king received the proposal for a ceasefire from the English envoy, Dahlbergh returned to Odense and reported the ice conditions in Lolland were good. The king decided to go immediately to Nyborg to consult with Wrangel and Corfitz Ulfeldt.