The traditional method of dealing with an armored breakthrough was to pick away at its sides, forcing it to maneuver away in order to find less-defended areas of advance. If these spoiling attacks can be set up on both sides of the route of attack, the armored spearhead is forced into an ever-decreasing frontage, eventually being pinched off and losing the ability to maneuver. The classic example of a successful anti-Blitzkrieg was during the Battle of the Bulge, where US units repeatedly forced the German spearhead inward, eventually pinching it off just short of the Meuse River. However, this approach required the forces to be deployed in depth, and the massive numerical superiority of the Warsaw Pact was the reverse of the numbers during the Bulge. Additionally, the concentration of low-mobility forces that formed the channelizing groups would invite nuclear strikes.