 Wales faced England at Twickenham for Gatland 's inaugural match as coach and their first match of the 2008 Six Nations . They had not defeated England there since 1988 , and went on to win 26 – 19 . They eventually won all their Championship matches , <unk> only two tries in the process , to claim another Grand Slam . Later that year Wales defeated Australia 21 – 18 in Cardiff , but then started a six @-@ year , twenty @-@ three @-@ game win @-@ less streak against the southern hemisphere nations of Australia , New Zealand and South Africa . 
