Why was Count Charles Henri d'Estaing's attempt to seize Savannah in 1779 a failure?

AGeorgia slaves infiltrated allied ships and sabotaged d'Estaing's efforts.

BAt the time of the attempted siege, d'Estaing only had one hundred soldiers.

CGeorgia Tory spies warned General Prevost that Count d'Estaing was on his way.

DInadvertently, Count d'Estaing gave the British time to bolster their defenses