Why was the Hexamillion wall incapable of preventing invasion?

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Unlike a city wall, that has people always around it to man and guard it, a free standing border wall tends to get stripped of manpower whenever the attention of the state building it falters. An unmanned wall isn't hard to get around, or over.

I've even read that some believe the main task of these border fences is less to hold invaders out, than to keep raiders in. A raiding party can cross over easily enough alone, but when laden with loot and prisoners, the wall crossing back will take long enough that the mobile security force will catch them in the act and be able to capture the raiding force, or at least make them abandon their gains.

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