This division two cup tie involved a 140-mile journey to a ground where Midhurst have never had much joy.
The home side got off to the best of starts when Warren Parsons broke down the right and drilled the ball home.
Midhurst's defence have been finding it difficult to play as a unit '“ possibly because of a lack of experience.
Westfield were full of running and after 25 minutes, Parsons steered his second past keeper Scott Lillywhite.
With four experienced players unavailable, Midhurst were unable to produce any football which troubled the home side. And on the
half-hour Sean Smith put away number three.
The defence were finding it heavy weather, while the Midhurst forwards were too often occupied in trying to help the defence.
Parsons claimed a hat-trick and Graham Morris '“ who had only just come on '“ netted goal number five. Midhurst's hopes of a goal were lifted when Danny Warren broke clear, but the home keeper held a driven shot from him.
Recent signing Joshua Clayton was replaced by Luke Sheldrick, which steadied the visitors.
ith 20 minutes left, Kevin White was heavily tackle and was unable to continue. His place was filled by Nick Waters. The sixth was scored by Duncan Jones and the final strike, from long range, came from Dave Miller.
Midhurst: Lillywhite, Holloway, Clayton, White, Carvalho, Hyde, Renshaw, Pelling, Warren, Hyde, Benjamin, Waters, Sheldrick.
* Midhurst reserves lost 4-1 at home to East Preston. Paul White was their scorer.