Having learned the powerful offensive attacks of the Soviet troops, the Germans began to pay more attention to the issues of strengthening the terrain. From individual systems of outposts, they moved on to a developed system of strongholds and defense nodes. Defensive lines were a chain of reinforced defense nodes and strongholds, saddling command heights, mostly grouped around settlements and located at a distance of 2 to 4 km from each other. The gaps were filled with machine gun and rifle trenches and separate firing structures. Defense nodes and strongholds of German defense were 1-2 lines of trenches and communication moves, with prepared in large numbers cells and sites for all types of fire weapons, observation posts, as well as shelters, shelters and dugouts for soldiers and officers. All strongholds were interconnected by a well-branched network of roads - radial and rocky, providing the possibility of a wide maneuver and transfer and reserves from the depths of defense.