The Blues went into the contest off the back of a 2-1 defeat to Norwich City, while the Baggies were one of three sides who had won their opening two games of the season.
The hosts started strongly taking the lead through Mikey Johnston, before Colby Bishop equalised in the second period to share the points.
There were 2,473 Blues supporters who made the trip to the Hawthorns and made themselves in the sold-out away-end at the Hawthorns.
Check out our fantastic fan photos and match action from our photographer Manjit Narotra.
21. Match Action
Pompey players applaud the travelling Fratton faithful. | Manjit Narotra/ProSportsImages
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