 The slaughter in the trenches of the First World War had a profound effect on Welsh literature with a more pessimistic style of prose championed by T. H. Parry-Williams and R. Williams Parry.The industrialisation of south Wales saw a further shift with the likes of Rhydwen Williams who used the poetry and metre of a bygone rural Wales but in the context of an industrial landscape.Though the inter-war period is dominated by Saunders Lewis, for his political and reactionary views as much as his plays, poetry and criticism.