On Sunday, 12th May 2013 Racing NSW Stewards, Shane Cullen and Danny Greer, together with Racing NSW Chief Investigator, Nathan Hayward, took part in an operation with the Casino and Racing Investigation Unit strikeforce “Trentbridge” which resulted in the withdrawal by Stewards of Prussian Secret and Hellifield from their engagements at yesterday’s Gunnedah Race Club race meeting.