At the same time David Collins departed from England in April 1803, aboard with orders to establish a colony at Port Phillip. After establishing a short lived settlement near the current site of Sorrento, he wrote to King, expressing his dissatisfaction with the location, and seeking permission to relocate the settlement to the Derwent River. Realising that the fledgling settlement at Risdon Cove would be well reinforced by Collins' arrival, King agreed to the proposal. Collins arrived at the Derwent River on 16 February 1804, aboard "Ocean". The settlement that Bowen had established at Risdon Cove did not impress Collins, and he decided to relocate the settlement down river, on the opposite shore. They landed at Sullivans Cove on 21 February 1804, and created the settlement that was to become Hobart. Soon after this, Collins decided that coastal defence was needed. A redoubt was dug not far from the settlement, and two ship's guns were placed within.