As a colonial subject and woman of colour, Una Marson occupies a unique place in the history of wartime broadcasting in Britain. Her weekly programCalling the West Indies began as a “message home” program for Caribbean soldiers stationed in the UK but grew, as the war progressed, into a literary and cultural forum for writers from across the Black Atlantic. Though barred from advocating openly for independence, Marson used her program to promote West Indian cultural autonomy by spotlighting emerging Caribbean literary figures and forging connections with activists and intellectuals from the U.S., Britain, Africa, and elsewhere. Beyond building such transatlantic networks, Calling the West Indies afforded listeners in the Caribbean the first opportunities to hear literature spoken in the West Indian forms of English which Edward Kamau Brathwaite would go on to call “nation language.” By focusing on Marson’s wartime work, this chapter rectifies a persistent tendency, in histories of Caribbean literature and broadcasting, to omit not only the central role played by this progressive feminist intellectual, but also the role of the war itself as catalyst to the postwar literary renaissance in the West Indies.