The English were not idle while the Spanish Armada prepared to sail. A series of signal beacons atop hills along the English and Welsh coasts were manned. When the Spanish ships were at last sighted of The Lizard on July 19, 1588, the beacons were lit, speeding the news throughout the realm. The English ships slipped out of their harbour at Plymouth and, under cover of darkness, managed to get behind the Spanish fleet.