A 25-year-old Mount Calvary firefighter was injured while fighting a house fire Sunday afternoon. At 3:23 p.m. Sunday, the Fond du Lac County Sheriff's Office and the Mount Calvary Fire Department were dispatched to W977 South Shore Lane for a house fire. The residence sustained significant damage in the kitchen area of the house. The occupants of the house were not injured. The injured firefighter was transported to St. Agnes Hospital for treatment and was later released, according to the Fond du Lac County Sheriff's Office.