CAMPO, Calif. -- A wildfire that blackened nearly 1,000 acres, destroyed one home and threatened scores of others this week in southeastern San Diego County was fully contained Thursday.

The so-called Old Fire erupted early Sunday afternoon near Old Highway 80 and Miller Valley Road in the Campo area, according to Cal Fire. Over the next 24 hours, the flames forced the evacuation of about 200 rural homes.

The blaze leveled a house and a recreational vehicle while spreading over about 995 acres east of Pine Valley. Two firefighters suffered minor heat exhaustion while working the lines. No other injuries were reported.

High winds and dry air made controlling the conflagration particularly challenging, particularly on Tuesday, when the dicey conditions prompted the National Weather Service to issue a "red flag'' wildfire-hazard warning, Cal Fire Capt. Mike Mohler said.

The cause of the blaze remains under investigation.