Fairmile Bs could serve in anti-submarine work

Were early motor gun boats converted for anti-submarine warfare?

Some early small craft, especially Fairmile Bs, could be used for anti-submarine work, although the category included more than converted motor gun boats.

Fairmile Bs could perform anti-submarine warfare, and other small boats also served in that role. The answer is deliberately broader than treating the whole early motor-gun-boat inventory as one conversion programme. This helps explain why the later list of British small craft contains overlapping motor launch, gunboat, and anti-submarine duties. It also points to the wartime pressure to obtain many adaptable hulls rather than one perfectly specialized type.