1. In a large stainless-steel pot, heat the oil over moderate heat. Whisk in the flour and cook, whisking, until starting to brown, about 4 minutes. Reduce the heat to moderately low. Stir in the onion, celery, and bell pepper and cook until starting to soften, about 7 minutes. Add the okra, bay leaf, thyme, oregano, salt, black pepper, cayenne, and tomatoes. Cover and cook for 5 minutes.
2. Stir in the broth and the smoked sausage. Bring to a boil. Reduce the heat and simmer for 15 minutes. Add the chicken and cook until just done, 4 to 5 minutes longer. Remove the bay leaf.
3. Meanwhile, bring a medium pot of salted water to a boil. Stir in the rice and boil until just done, 10 to 12 minutes. Drain. Put a mound of rice in the center of each bowl. Ladle the gumbo around the rice.
Wine Recommendation: No region of the wine world is producing more exciting wine bargains than the Languedoc-Roussillon in southern France. Try any one of their sturdy reds with this hearty gumbo.