The barrier permanently isolated the Wilayas from outside support. [causal]
It signified the end of any serious attempt to breach the barrier. Henceforth the Wilayas would be virtually cut off from the exterior. It was a major military victory for the French, and clearly recognisable as such in army messes.
Horne, Alistair, A Savage War of Peace- Alge…, loc. 820