The 5th Special Air Service or 5th SAS was an elite airborne unit during World War II, consisting entirely of Belgian volunteers. It saw action as part of the SAS Brigade in Normandy, Northern France, Belgium, the Netherlands and Germany. Initially trained in sabotage and intelligence gathering, they converted to motorised reconnaissance on armoured jeeps. They were noted for being the first Allied unit to set foot onto Belgian soil and the first to cross the Siegfried line. This latter feat although was merely accomplished by accident.