Both sides ended the game reduced numbers on the field, but it was the Devon visitors who recorded a good 2-0 win.
After a goalless opening 45 minutes, the Hammers were dealt a massive blow when they had Maxwell Buckler sent-off in the 53rd minute after a late challenge deemed reckless by the referee.
But parity on the pitch was restored on the hour-mark when Willand had Ryan Guppy dismissed.
However, 9 minutes later, the prolific Owen Howe broke the deadlock to give the visitors the lead.
Then on 76 minutes, Rovers were awarded a penalty which also saw Chris Clarke sent-off and Howe net his second goal from the spot.
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