Fry sausages, cool and cut into thin slices (pork links each into 3 pcs). Cut beef round into pieces. Fry pieces in large pot until meat iss brown and tender, remove meat. Chop all vegs., add to drippings in pot, saute until light brown. Add flour to make a roux. When roux is golden brown, add water, sausage and meat. Cook until meat and sausages are tender and gumbo thickens. Add oysters. Cook until tender. Add file 1/2 hr. before gumbo is finished.