In the article the author addresses one of the little-studied issues of the history of the Great Patriotic War in regional historiography. The construction of defensive lines on the territory of the Saratov region, which was located for a long time in the near rear of the Soviet-German front, was carried out for a year and a half, took on a large spatial scale and required large-scale expenditures of human and material resources. From the autumn of 1941 until March 1943, six field-type defense lines with a total length of over 600 kilometers were built in the region.