Brighton skipper Mark Jenkins sang the praises of his side after they snatched a 14-12 win at Crawley.
The Waterhall outfit were staring at a shock defeat when they trailed 12-0 inside the last ten minutes.
Andy Light then came up with two tries, both converted by Mark Gibb, to turn the tie.
Tudor Ellis and Duncan Robinson earned high marks in the pack for the winners.
Last season's runners-up Chichester made Trophy progress without breaking sweat as hosts Heathfield and Waldron forfeited the tie.
Haywards Heath and Worthing both had byes into the second round.
There are still two outstanding matches in the first round and the Sussex RFU will not make the draw for the last eight until all results are known.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article