The Siegfried Line was a German defensive fortification built during the 1920s and 1930s, primarily along the western border of Germany. It was designed to protect against potential invasions from countries like France and Belgium. The line consisted of bunkers, tank traps, and other military structures, serving as a strategic barrier during World War II. During the war, the Siegfried Line was tested by Allied forces, particularly during the Battle of the Bulge in late 1944. Despite its formidable construction, the line was eventually breached, leading to the retreat of German troops and contributing to the overall defeat of Nazi Germany.