The Royal Navy supplemented merchant crews in wartime logistics

Did the Royal Navy operate merchant cargo ships during the Second World War, and when were naval crews used?

Yes. The Merchant Navy carried much of the burden, but the Royal Fleet Auxiliary and Royal Navy also operated ships when wartime demand required every available hull.

The Royal Navy operated merchant-type cargo ships during the Second World War. The Merchant Navy handled a great share of British transport, while the Royal Fleet Auxiliary provided an established naval support layer. In the most demanding years, especially through roughly 1943, the Royal Navy also took ships into service because it needed every available hull. Total war blurred peacetime distinctions between civilian shipping, auxiliaries, and commissioned naval logistics.