If the Russians pulled an armored advance thru Europe of the 60's and 70's they would have been met at the French border with French nukes, or a French surrender. Should be noted that by this time, France was no longer participating in NATO armament, command, commonality or military exercises.
Should also be noted that as far as I'm aware, not ONE 'Reforger' exercise was 'won' by the US. Every single time we ran this massive all-out 'wargame' exercise with the West Germans in the 'soviet' role we had our tulips handed to us. The west german military of the time was far and away the most motivated and effective modern 'kill the enemy's armor' force on the planet. Those guys really knew how to kill tanks.
The enitre West German force was well suited to fighting a defensive war on it's own soil.. and if faced with a soviet invasion they would have fought like lions, knowing full well that US/NATO policy would have forced the use of defensive tactical nukes on west german soil if the west german army failed to contain the soviet advance. They would not have been 'pushovers'... they were extremely motivated; knowing that their homes, familys, cities and land would be a nuclear battlefield in a soviet/NATO confrontation if they were unable to stop a soviet advance via conventional means.