Siegfried Line Germany's Siegfried Line stood in the way of Allied forces making a swift invasion into Germany from the west. The wall was comprised of three-foot high concrete obstacles called “dragon's teeth.” They were often wired, surrounded by mines and covered by Nazi machine guns and indirect fire. SHARE: Download: Full Size (0.3 MB) Tags: World War II Credit: Army photo VIRIN: 150401-A-UK001-702.JPG Photo Gallery