If Philip met the shock with a calm patience, it at once ruined his plans in the West. France broke again from his grasp. Since the day of the Barricades Henry the Third had been virtually a prisoner in the hands of the Duke of Guise; but the defeat of the Armada woke him to a new effort for the recovery of power, and at the close of 1588 Guise was summoned to his presence and stabbed as he entered by the royal bodyguard. The blow broke the strength of the League. The Duke of Mayenne, a brother of the victim, called indeed the Leaguers to arms; and made war upon the king. But Henry found help in his cousin, Henry of Navarre, who brought a Huguenot force to his aid; and the moderate Catholics rallied as of old round the Crown. The Leaguers called on Philip for aid, but Philip was forced to guard against attack at home. Elizabeth had resolved to give blow for blow. The Portuguese were writhing under Spanish conquest; and a claimant of the crown, Don Antonio, who had found refuge in England, promised that on his landing the country would rise in arms. In the spring of 1589 therefore an expedition of fifty vessels and 15,000 men was sent under Drake and Sir John Norris against Lisbon. Its chances of success hung on a quick arrival in Portugal, but the fleet touched at Corunna, and after burning the ships in its harbour the army was tempted to besiege the town. A Spanish army which advanced to its relief was repulsed by an English force of half its numbers. Corunna however held stubbornly out, and in the middle of May Norris was forced to break the siege and to sail to Lisbon. But the delay had been fatal to his enterprise. The country did not rise; the English troops were thinned with sickness; want of cannon hindered a siege; and after a fruitless march up the Tagus Norris fell back on the fleet. The coast was pillaged, and the expedition returned baffled to England. Luckless as the campaign had proved, the bold defiance of Spain and the defeat of a Spanish army on Spanish ground kindled a new daring in Englishmen while they gave new heart to Philip's enemies. In the summer of 1589 Henry the Third laid siege to Paris. The fears of the League were removed by the knife of a priest, Jacques Clement, who assassinated the king in August; but Henry of Navarre, or, as he now became, Henry the Fourth, stood next to him in line of blood, and Philip saw with dismay a Protestant mount the throne of France. [Sidenote: Henry the Fourth.]