It has often been alleged that, in the wake of the devastating riots that shook Paris in the May of that year, the loyalty promised by Massu (then commanding the army in Germany) was made conditional upon an amnesty for all his fellow-officers still atoning for sins committed during the Algerian war.

QUESTION: Whether the amnesty deal actually occurred and how it shaped de Gaulle's decisions is contested political history worth digging into.

Horne, Alistair, A Savage War of Peace- Alge…, loc. 1455