...In “Seven Days to the Rhine,” Soviet nuclear forces would destroy Hamburg, Dusseldorf, Cologne, Frankfurt, Stuttgart, Munich and the West German capital of Bonn. NATO headquarters in Brussels would be annihilated, as would the Belgian port of Antwerp. The Dutch capital and port of Amsterdam would also be destroyed. Denmark would suffer two nuclear strikes.
The result would be a headless NATO and the destruction or demoralization of civilian governments in West Germany, Belgium, the Netherlands and Denmark—precisely the countries likely to be occupied at the end of the seven days. The elimination of the port cities of Hamburg, Antwerp and Amsterdam would severely curtail NATO’s ability to flow reinforcements from the United Kingdom and North America.
Curiously, France and the United Kingdom were to be spared nuclear strikes. This is probably because both had independent nuclear arsenals not tied to the United States. The United States might have hesitated to retaliate for fear of escalating to strategic nuclear warfare, but for France and the UK the European atomic battlefield was much closer and the dividing line between tactical and strategic not so clear-cut. The Soviet leadership probably had no intention of continuing war with either one on the eighth day.
After the Warsaw Pact had launched nuclear strikes, conventional forces would be sent in to conquer. Seven Days to the Rhine assumed a radioactive zone that used to be called Poland, dividing the Soviet Union from its forces in East Germany, Czechoslovakia and Hungary. Those forces, along with their East German, Czechoslovak and Hungarian counterparts, would need to suffice to carry out the attack. While Polish forces were theoretically available, by 1979 the Soviets would have reason to suspect their political reliability.
As a result, total forces committed would be roughly the same number of forces the pact would have in a no-notice attack on NATO. Planning with the assumption of a radioactive curtain severing forward pact forces from the Soviet Union itself is also a reasonable model for assuming a quick war without a prewar buildup of ammunition and fuel from the Soviet Union.
Leading the spearhead aimed at the heart of NATO would be the Group of Soviet Forces in Germany. The GSFG was comprised of five armies, each with three or four tank and motor-rifle (mechanized infantry) divisions...