SAN DIEGO -- More than 1,100 firefighters battled to contain a wildfire that scorched some 4,000 acres in the northeast reaches of Camp Pendleton.

The blaze, apparently sparked by live-fire military drills late Tuesday morning, was about 40 percent contained Friday, authorities said.

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CAMP PENDLETON FIRE IMAGES: See Images Of Flames

One firefighter suffered a minor burn, but no structures had been reported damaged as of Friday morning, said Jeff Wenger, an information officer with the U.S. Forest Service's Federal Incident Management Team.

While none of the homes or ranches bordering the 4,000-acre burn area was immediately threatened, hundreds of residents in the De Luz area were evacuated.

A shelter to house the evacuees has been set up by the American Red Cross at a Catholic church on South Stage Coach Lane in nearby Fallbrook.

Efforts to bring the wildfire under control were gaining urgency as the weekend approached, with forecasters predicting Santa Ana conditions expected to generate 30-mph winds, plus erratic gusts.

Even without strong winds, firefighters have been restricted by rugged terrain and their inability to venture onto the military base because of the threat of undetonated ordnance.