Bourguiba’s motives remain somewhat obscure, but personal prestige seems to have played its part. After a series of poor harvests and economic misfortunes, his reputation at home was badly in need of a boost, while in the Arab world he may well have felt pressed to react to the outpourings over Nasser’s Radio Cairo, endlessly accusing him of having sold out to the West and of being a bad Arab. At the same time he was under pressure from his uncomfortable guests, the F.L.N., to do something more spectacular to force de Gaulle to make peace. Fed up with the way Evian had collapsed, he may also have wanted to prove to the Algerians that he too was a good radical nationalist. Whatever his motives, he seems to have believed that he could go right to the brink and de Gaulle — in his present state of debility — would yield. It was a tragic miscalculation, because — for that very reason — an obvious military challenge was something de Gaulle could not possibly countenance.

XREF: Connects to patterns of overplaying one's hand in diplomacy and the logic of credibility under domestic pressure.

Horne, Alistair, A Savage War of Peace- Alge…, loc. 1442