Byron Harrison and Robins captain Russell Penn came close to scoring for the League Two outfit .
The Hammers , who had Alou Diarra stretchered off in the first half , held on to progress to round three .
Byron Harrison and Robins captain Russell Penn came close to scoring for the League Two outfit , but the Hammers , who had Alou Diarra stretchered off in the first half , held on to progress to round three .