Under pressure from the French army, he adopted a decisive new strategy: instead of attempting to back up the Wilayas at appalling cost across the Morice Line, the A.L.N. would be regrouped and reorganised inside the Tunisian sanctuary, and held there in readiness for future military and political opportunities. It was a strategy that would, to some extent, deceive the French Army Command into believing the military successes of the Challe Plan were greater than in fact they were—with consequences that will shortly be seen.

XREF: Connects to other war strategies where tactical retreats intentionally deceive an enemy about genuine success, similar to strategic withdrawals in other insurgency conflicts.

Horne, Alistair, A Savage War of Peace- Alge…, loc. 993