 Following the Second World War , Wales played a New Zealand Army team ( the <unk> ) in 1946 , which Wales lost 11 – 3 . The Five Nations ( suspended during the war ) resumed in 1947 when Wales shared the title with England . Although Wales suffered their first home defeat to France in 1948 , they won their first Five Nations Grand Slam since 1911 in 1950 . The next year , they lost to the touring South Africans 6 – 3 despite dominating in the line @-@ outs . They achieved another Grand Slam in 1952 , followed by a 13 – 8 win over the All Blacks in 1953 . In 1954 , St Helens in Swansea ( a Welsh international venue since 1882 ) hosted its last international and Cardiff Arms Park officially became the home of the Welsh team . In 1956 , Wales again won the Five Nations , but they did not regain the title until 1964 and did not win it outright until 1965 . 
