ships-of-the-line were divided into two columns, with the weather column forming the northern flank and the lee column the southern flank. The enemy line had been sailing north to south in front of the wind. Just as the battle was beginning they turned individually anticlockwise, wore ship, and came into the wind, hoping to bear down on Nelson. The order of British ships in the table is the one of that moment. Prior to closing with the enemy, they were in a single line, and after engagement, the ships manoeuvred to assume the best firing positions. The British fleet of the battle consisted of 33 warships, 27 of which were ships of the line. During the battle the frigates (which had been the force observing Cadiz) and smaller vessels acted in support to the fleet, relaying messages and towing ships but did not engage. When Collingwood took command after Nelson's death he transferred to Euralyus as his own flagship, the Royal Sovereign, was badly damaged. Franco-Spanish fleet Just before the engagement the French and Spanish ships of the line had been sailing north to south. After wearing, the order of sailing was reversed, so that the former head was now the rear. During the battle itself the entire line broke into small units and individual ships. The combined fleet consisted of 40 vessels with 18 French ships of the line and 15 Spanish ships of the line. Losses Below is a graph of the percentage of casualties plotted for each ship along the three battle columns. The graph is a construct only. The losses were incurred throughout the entire battle and after, most while the ships were not actually in that order. The order in the graph is shown as a convenience. Three columns and a separate ship are shown on the horizontal axis, which represents units of conventional distance between ship positions. All units are assumed to be the same. There are three origin points, one for the beginning of each column and the Africa, which was not in the three. The vertical axis shows percentage of casualties per ship. For example, casualties for the Victory are plotted at 20%. A casualty is someone who was known to have been wounded, someone who was known to have been killed, or someone missing in action and presumed drowned. The percentage is the ratio of casualties to ship's complement multiplied by