Graham Potter's team's last Premier League win came on the road - a 1-0 win at Liverpool.
Southampton go in search of a first home win since 4th January, having lost nine of their last 11 Premier League matches.
Dunk puts Albion in front as he meets Gross' corner to head past Forster, before Adams volleys Saints back level.
Trossard restores Albion's lead ten minutes after the restart from Welbeck's flick.
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