We don't really have a good number for this. We know about 400 civilian vessels of various sizes took part in the evacuation. These were accompanied by several hundred small boats; rowing boats, dinghies, and the like. However, many of these craft were not manned by their civilian owners. Many of the largest vessels - passenger liners and ferries - were manned by crews from the Royal Naval. These ships had been requisitioned by the RN before the war, and were serving as armed boarding steamers, troopships or hospital ships. Others had been requisitioned to serve as troopships, but retained their Merchant Navy crews. The same was true of the smaller merchant ships. One of the largest contingents of these was a force of forty Dutch small motor coasters. These were manned by combinations of both Royal Navy ratings, and their original Dutch crews. However, the smaller craft were crewed mainly by RN ratings, or by volunteers from amongst the Army personnel trapped on the beach. As an example, 19 lifeboats from the RNLI took part in the evacuation, but only two were manned by their civilian crews. Over the course of the evacuation, there were 125 deaths and 81 wounded from the civilian participants. Of these, four of the dead and two of the wounded were civilian volunteers, while the remainder were from the Merchant Navy crews of troopships like Mona's Queen, sunk by bombing on the 29th May. This suggests that there were relatively few civilian volunteers taking part in the evacuation compared to the contingents from the Royal Navy and Merchant Navy.