Sustained winds up to 8 mph (13 kph) were expected to keep pushing flames Wednesday into areas of swamp parched by drought inside the Okefenokee National Wildlife Refuge, where a lightning strike sparked the blaze April 6. More than 470 firefighters and support personnel are working to keep the fire from escaping the refuge and burning private land. [...] occurring fire keeps the swamp from becoming overgrown, which over time would convert it to uplands.