"British mining operations" . . . . . . . . . "mining Norwegian waters" . . "laid a number of minefields" . . "attempting to cut off" . . "''Wilfred''" . . "minelaying" . "Wilfred" . "Operation Wilfred" . . "laid out a number of minefields" . "a mining operation" . "laid in the area" . . "Operation Wilfred" . . . "claimed to have laid a naval minefield" . "laid three naval mine fields" . . . "British 8 April mining operations" . "mines would be laid in Norwegian waters" .