force was defeated and notable poet Philip Sidney mortally wounded, which was a huge blow to English morale. Zutphen itself and Deventer were betrayed by Catholic turncoats William Stanley and Rowland York, which further damaged Leicester's reputation. Finally Sluis with a largely English garrison was besieged and taken by the Duke of Parma in June 1587, after the Dutch refused to help in the relief. This resulted in mutual recriminations between Leicester and the States. Leicester soon realised how dire his situation was and asked to be recalled. He resigned his post as governorhis tenure had been a military and political failure, and as a result, he was financially ruined. After Leicester's departure, the Dutch elected the Prince of Orange's son Count Maurice of Nassau as the stadtholder and governor. At the same time Peregrine Bertie took over English forces in the Netherlands. Spanish Armada On 8 February 1587, the execution of Mary, Queen of Scots outraged Catholics in Europe. In retaliation for the execution of Mary, Philip vowed to invade England to place a Catholic monarch on its throne. In April 1587 Philip's preparations suffered a setback when Francis Drake burned 37 Spanish ships in the harbour of Cádiz, and as a result the invasion of England had to be postponed for over a year. On 29 July, Philip obtained Papal authority to overthrow Elizabeth, who had been excommunicated by Pope Pius V, and place whomever he chose on the throne of England. He assembled a fleet of about 130 ships, containing 8,000 soldiers and 18,000 sailors. To finance this endeavour, Pope Sixtus V had permitted Philip to collect crusade taxes. Sixtus had promised a further subsidy to the Spanish should they reach English soil. On 28 May 1588, the Armada under the command of Duke of Medina Sidonia set sail for the Netherlands, where it was to pick up additional troops for the invasion of England. As the armada sailed through the English channel, the English navy led by Charles Howard, 1st Earl of Nottingham, and Francis Drake fought a battle of attrition with the Spanish from Plymouth to Portland and then to the Solent, preventing them from securing any English harbours. The Spanish were forced to withdraw to Calais. While the Spanish were at anchor there in a crescent-shaped defensive formation, the English used fireships to break the formation and scatter the Spanish ships. In the subsequent