Tunisia balanced sanctuary for rebels against avoiding French reoccupation. [causal]
President Bourguiba, always apprehensive that too overt a support for the F.L.N. could provoke a French reoccupation of his country, and in any case a dedicated exponent of maximum co-operation with France, provided Ben Bella with somewhat less than he wanted. His policy remained consistent throughout: Tunisia would grant the F.L.N. rights of sanctuary, but it would not openly join in the war, and its highest goal would be to persuade both parties that their only prospect lay in negotiation.
Horne, Alistair, A Savage War of Peace- Alge…, loc. 406