On what date was the Brookwood, which weighed over 5,008 tons, attacked?
CREATE TABLE "ships_attacked" (
  "date" text,
  "name_of_ship" text,
  "flag" text,
  "tonnage" real,
  "fate" text
);
SELECT "date" FROM "ships_attacked" WHERE "tonnage">'5,008' AND "name_of_ship"='brookwood';