Digging in is a temporary measure. You must be able to be mobile and move with the threat. Pillboxes and dug in tanks provide the illusion of strength. How many defensive lines have been cut apart or maneuvered around, most all of them. As soon as it is breached the line has to fall back or risk being encircled. The Russians tactic of giving ground and moving back while inflicting losses is a good plan. At some point the offence is stretched too far and is vulnerable to counterattack. Who controls the ground in the end matters, not who controls it in the middle of the process.
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