What is "wallerfangen"

Wallerfangen (French: Vaudrevange/Valdrevange) is a municipality of Saarlouis district, Saarland, Germany. Located west of Saarlouis and along the French border, it is the seat of the villages of Ittersdorf, Ihn, Leidingen, St. Barbara, Kerlingen, Gisingen, Rammelfangen, Oberlimberg, Bedersdorf, and Düren.