[2][3] In November 1658, Goodsonn was appointed Commander of the English Baltic Fleet that instructed to transport General at Sea Sir George Ayscue who was being loaned to Sweden to assist in their naval operations against Denmark and the Dutch.

[4] In the autumn of 1658, a Dutch fleet commanded by Jacob van Wassenaer Obdam defeated the Swedes in the Battle of the Sound and lifted the blockade of Copenhagen.

[5] To protect English interests, on 13 November 1658 the Commonwealth Protector Richard Cromwell ordered a fleet to be sent to the Sound.

The ships in Goodsonn’s fleet that conducted operations in the Sound were Swiftsure, Speaker, Plymouth, Newbury, Gloucester, Bridgewater, Essex, Newcastle, Ruby, Centurion, Nantwich, Preston, Adventure, Assurance, Maidstone, Expedition, Fagons, Forester, Elias, and Hind.

Goodsonn left Aldborough Bay on 18 November, but after three days he was forced back to port by strong winds.

[7] At the end of March 1659, Mountagu set out for the Baltic with a new fleet of 40 ships, with Goodsonn and Sir Richard Stayner as his deputies.