(contrary to claims by Admiral Hood that his fleet was fit for a month of service) necessitated repairs en route. Graves was also concerned about some ships in his own fleet; Europe in particular had difficulty manoeuvring. Battle lines form French and British patrol frigates each spotted the other's fleet around 9:30 am; both at first underestimated the size of the other fleet, leading each commander to believe the other fleet was the smaller fleet of Admiral de Barras. When the true size of the fleets became apparent, Graves assumed that de Grasse and Barras had already joined forces, and prepared for battle; he directed his line toward the bay's mouth, assisted by winds from the north-northeast. De Grasse had detached a few of his ships to blockade the York and James Rivers farther up the bay, and many of the ships at anchor were missing officers, men, and boats when the British fleet was sighted. He faced the difficult proposition of organizing a line of battle while sailing against an incoming tide, with winds and land features that would require him to do so on a tack opposite that of the British fleet. At 11:30 am, 24 ships of the French fleet cut their anchor lines and began sailing out of the bay with the noon tide, leaving behind the shore contingents and ships' boats. Some ships were so seriously undermanned, missing as many as 200 men, that not all of their guns could be manned. De Grasse had ordered the ships to form into a line as they exited the bay, in order of speed and without regard to its normal sailing order. Admiral Louis de Bougainville's Auguste was one of the first ships out. With a squadron of three other ships Bougainville ended up well ahead of the rest of the French line; by 3:45 pm the gap was large enough that the British could have cut his squadron off from the rest of the French fleet. By 1:00 pm, the two fleets were roughly facing each other, but sailing on opposite tacks. In order to engage, and to avoid some shoals (known as the Middle Ground) near the mouth of the bay, Graves around 2:00 pm ordered his whole fleet to wear, a manoeuvre that reversed his line of battle, but enabled it to line up with the French fleet as its ships exited the bay.