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The German Army believed that any fortified position should consist of small works, organized in great depth. The idea was not to present an unyielding front to the attacker, but rather to act as a shocj absorber and gradually slow doen the advance. Then, when the attacker has lost his momentum, a series of counterattacks would destroy the penetration before the attacker had reorganized and consolidated his gains. The Germans would typically man their defense postions with inferior soldiers in concrete positions and group their best soldiers and equipment in reserve, ready for the counterattack. The soldiers defending these positions were carefully trained to continue fighting, even when their positions were being overrun.

The Germans would typically organize their defenses into three zones, these were:
1) The Forward Zone (Vorfeldzone) consisting mostly of field fortifications, trenches, barbed wire entanglements, machine gun emplacements and observation posts.
2) The Main Defense Zone (Groskampfzone) comprised of fortified structures such as pillboxes, casemates and shelters and antitank obstacles covered by antitank guns. In addition, this zone would have intermediate areas to its front and rear, in which isolated works were placed at critical points along the avenues of approach, with the mission od disrupting and delaying the advnace as well as channeling the attackers into pre-planned killing zones.
3) The Rear Defense Zone (Ruckwartige Zone), organized mush as the Groskampfzone, but not as strong, as the attacker continued his attack, this would often be built up and converted into a Groskampfzone and a new Ruckwartige Zone would be built to the rear.

The Germans would emplace their pillboxes, casemated and field fortifications in order to provide interlocking fields of fire, but not so close together that enemy artillery would be able to mass its fire on a particular sector. The Germans build their fortifications along the principle of "Effect before cover", in this, a wide field of fire is considered to be more important in the siting of a position than any cover or concealment. Whenever possible fortifications are sited to permit both frontal and flanking fire. Defensive fire plans are carefully coordinated so that artillery concentrations can be laid on the areas where fire coverage from the positions is relatively weak.

In accordance with this doctrine, the Germans carefully reinforce their pillboxes and casemates with extensive field fortifications that lend flexibility and mobility to the defending troops as well as allowing the defenders to engage the enemy before he gets close enough to engage the main works. A typical pillbox position would included barbed-ware and minefields, fire trenches for infantry and open emplacements for mortars and field artillery, typically placed to cover the dead zones around the fortification.

The German practice is to provide all troops with adequate shelter against weather and hostile fire. pillboxes and casemates often have accommodations for their crews, field works would have underground shelters adjacent to the combat positions. The reserves would also enjoy underground shelters, these would protect them from enemy bombardment until they are committed to the counterattack.

German fortified positions are commonly linked together by communications trenches, to allow the relief of personnel, ammunition resupply and the evacuation of the wounded. In many cases, a group of defenses would be connected by a system of tunnels. SIgnal communication is provided by buried telephone wire, with telephones often being used to communicate between the inside/outside of a positions. In some pillboes, speaking tubes are installed in case of the failure of the telephone system.


Source material is World at War #27 "Atlantic Wall Analysis" and the "German Army Handbook"