On 20 July, the English fleet was off Eddystone Rocks with the Armada upwind to the west. To execute its attack, the English tacked upwind of the Armada, thus gaining the weather gage, a significant advantage. At daybreak on 21 July, the English fleet engaged the Armada off Plymouth near the Eddystone Rocks. The Armada was in a crescent-shaped defensive formation, convex toward the east. The galleons and great ships were concentrated in the centre and at the tips of the crescent's horns, giving cover to the transports and supply ships in between. Opposing them, the English were in two sections, with Drake to the north in with 11 ships, and Howard to the south in with the bulk of the fleet.