It is called General Defense Plan:
The General Defense Plan (GDP) of NATO was a regularly updated operational plan for the NORTHAG (Northern Army Group) and CENTAG (Central Army Group) in the event of a defense scenario. These plans, classified as "NATO-Secret," are now publicly accessible in the German Bundesarchiv .
The Warsaw Pact's attack plan aimed to annihilate the 1st German Corps and the 2nd British Corps in a pincer movement. The first wave of the attack was intended to break through the combat zone of the Dutch 1st Corps on its left flank, driving a wedge between it and the 1st German Corps. This would have forced the Dutch to bring in reinforcements from the Netherlands, causing a critical delay of 1-2 days. The 3rd Assault Group of the NVA was to advance via Uelzen and the Munster training area to the Weser River, aiming to cut off the British and German corps. The natural bottlenecks of the Harz and Weserbergland would have significantly restricted the mobility of the British forces.
Braunschweig played a key role in preventing an early encirclement and was to be defended primarily from the south. Both sides were aware of this threat, which is why the GDP included provisions for the deployment of German and British reserve divisions. The Warsaw Pact's objective was to reach the Weser and Rhein rivers within a week to decisively influence the course of the war before US Reforger troops could arrive.
NORTHAG adhered to the doctrine of "Forward Defense," which involved a 24-hour delaying action up to the Elbe-Seitenkanal near Uelzen. The outcome of the war was expected to be determined within this 24-hour period, as it was assumed that all forces would be exhausted by that time.
@PikeyI have Stasi documents from the GDR containing intelligence information about NATO FlaRak (surface-to-air missile) positions that were to be occupied in the event of a war outbreak. These are not fixed SAM (surface-to-air missile) positions but rather coordinates where mobile systems, such as ROLAND, would be stationed. If there is interest, feel free to send a DM. Also @Whiskey11 just in case you missed my DM on Discord