 Complete the following phrase:  From 1586, Walsingham received many dispatches from his agents in mercantile communities and foreign courts detailing Spanish preparations for an invasion of England. Walsinghams recruitment of Anthony Standen, a friend of the Tuscan ambassador to Madrid, was an exceptional intelligence triumph and Standens dispatches were deeply revealing. Walsingham worked to prepare England for a potential war with Spain, in particular by supervising the substantial rebuilding of Dover Harbour, and encouraging a more aggressive strategy. On Walsinghams instructions, the English ambassador in Turkey, William Harborne, attempted unsuccessfully to persuade the Ottoman Sultan to attack Spanish possessions in the Mediterranean in the hope of distracting Spanish forces. Walsingham supported Francis Drakes 