Craig Miles claimed four wickets as Gloucestershire bowled out Sussex for 286 on the opening day of the Specsavers County Championship match at Cheltenham.
An intriguing start to the annual festival at the College Ground saw fortunes sway after the visitors had won the toss.
They looked well placed at 74 without loss and 210-4, but the home bowlers stuck to their task, led by Miles, who returned 4-68 from 18 overs.
Nineteen-year-old off-spinner George Drissell took his maiden first class wicket on the way to figures of two for 38 from ten overs.
There were also two victims for Kieran Noema-Barnett, while half-centuries from Phil Salt (57), Harry Finch (76) and Ben Brown (59) boosted the Sussex total.
By the close Gloucestershire had reduced the deficit by 42 without losing a wicket, skipper Chris Dent making 12 not out and Cheltenham-born Miles Hammond unbeaten on 27.
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