After this event, Drury led two raids into Scotland; at least thrice he went to that country on more peaceable errands, during which, however, his life was continually in danger from assassins. As ambassador with Thomas Randolph in April 1572 he stayed at Restalrig Deanery. There he plotted with Archibald Douglas to kidnap George, Lord Seton from the shore at Leith, but the plan did not take effect. In May 1573 he commanded the force which compelled Edinburgh Castle to surrender. A year later, a letter of the defeated and executed commander of castle, William Kirkcaldy of Grange came to light, which mentioned the jewels Mary, Queen of Scots had left behind in Scotland, and that Drury had taken some for a loan of £600.