20 October for Villeneuve to get his fleet organised; it eventually set sail in three columns for the Straits of Gibraltar to the southeast. That same evening, Achille spotted a force of 18 British ships of the line in pursuit. The fleet began to prepare for battle and during the night, they were ordered into a single line. The following day, Nelson's fleet of 27 ships of the line and four frigates was spotted in pursuit from the northwest with the wind behind it. Villeneuve again ordered his fleet into three columns, but soon changed his mind and restored a single line. The result was a sprawling, uneven formation. At 5:40 a.m. on 21 October, the British were about 21 miles (34 km) to the northwest of Cape Trafalgar, with the Franco-Spanish fleet between the British and the Cape. About 6 a.m., Nelson gave the order to prepare for battle. At 8 a.m., the British frigate Euryalus, which had been keeping watch on the Combined Fleet overnight, observed the British fleet still "forming the lines" in which it would attack. At 8 a.m., Villeneuve ordered the fleet to wear together (turn about) and return to Cádiz. This reversed the order of the allied line, placing the rear division under Rear-Admiral Pierre Dumanoir le Pelley in the vanguard. The wind became contrary at this point, often shifting direction. The very light wind rendered manoeuvring virtually impossible for all but the most expert seamen. The inexperienced crews had difficulty with the changing conditions, and it took nearly an hour and a half for Villeneuve's order to be completed. The French and Spanish fleet now formed an uneven, angular crescent, with the slower ships generally to leeward and closer to the shore. By 11 a.m. Nelson's entire fleet was visible to Villeneuve, drawn up in two parallel columns. The two fleets would be within range of each other within an hour. Villeneuve was concerned at this point about forming up a line, as his ships were unevenly spaced in an irregular formation drawn out nearly five miles (8 km) long as Nelson's fleet approached. As the British drew closer, they could see that the enemy was not sailing in a tight order, but in irregular groups. Nelson could not immediately make out the French flagship as the French and Spanish were not flying command pennants. Nelson was outnumbered and outgunned, the enemy totalling