Hull damage and crew loss boxes still unrepaired after battle:

HMS Bengal hull repairs completed on return to squadron. -1 Crew box until return to port.

Mercury sank. 4 crew recovered.
Brittany -3 hull damage. -4 crew boxes. +2 crew from Mercury = -2 crew boxes.
Opulant -4 hull damage. -2 crew boxes. +2 crew boxes from Mercury = -0 crew boxes.

Opulant and Brittany split recovered crew from Mercury.