Around 150 people have turned out in Crickhowell High Street in Powys to oppose plans to convert a pub in the High Street into a convenience store.
Around 1,500 have already signed an online petition opposing the plans say campaigners.
Protestors say the town centre is almost entirely served by family-run shopsand stores and the independent stores "are a major draw for tourists".
They're now trying to prevent a national chain from turning the The Corn Exchange pub into a convenience store.
Crickhowell boasts one of the few independent High Streets in Wales, it's one of the towns unique selling points. Crickhowell is already well served by 3 independent convenience stores, two butchers, a bakers, an off licence and a florist, to name a few would suffer loss of business as a result of this application being granted. The whole dynamic of our town would change dramatically.
The planning application will be decided by the Brecon Beacons National Park.