[Jimbuna]

It was often the case that a BB and close escort would shadow a convoy from a distance during the day but during the night they would on occasion rejoin the convoy because it was felt the BB would be less vulnerable to torpedo attack during the hours of darkness when surrounded by merchantmens hulls......the accompanying escort would then bolster up the convoy escort.

The usually heavy AA weaponry was also useful to help in cases of attack from the air.