SUPERMARKET wars are heating up in Cinderford with Mid-Counties Co-operative taking its fight against Asda to the High Court.
The company is trying to block its rival's plans to open a store in Steam Mills Road.
Planning permission has been granted by Forest of Dean District Council but it has applied for the decision to be quashed via a judicial review.
The supermarket chain, which has branches in Cinderford, Coleford, Lydney and Mitcheldean, has also sent a letter to its members asking them to object to a fresh planning application by Asda.
The move has incensed residents who say Co-op should not have a "monopoly" on the Forest.
They are due to march through the streets of Cinderford on Saturday to protest against the "unprofessional tactics".
Coleford resident Adrian Lane launched a campaign last month via Facebook group Asda4Cinderford and has 1,300 members.
The father-of-two said: "Cinderford needs a big name supermarket. We don't want to be dictated to by Co-op, who have a monopoly in the Forest."
"I don't think they are acting in a very professional way."
Asda, the police and the Forest of Dean District Council have all said they are aware of the protest.
A council spokesman said the new application will be discussed by a committee but no date has been set.
It has so far received 107 letters of support and 39 of objection.
The Co-op were unavailable for comment.