Earlier copper mining had been small in scale, but Elizabeth I, concerned for the defence of her kingdom, required large quantities of copper for the manufacture of weapons and the strengthening of warships. There was the additional advantage for her that the Crown was entitled to royalties on metals extracted from English land. The experts in copper mining were German, and Elizabeth secured the services of Daniel Hechstetter of Augsburg, to whom she granted a licence to "search, dig, try, roast and melt all manner of mines and ores of gold, silver, copper and quicksilver" in the Keswick area and elsewhere.