More than 200 residents have told council planners and developers to keep their hands off Sutton Coldfield’s green fields.
Protesters walked around almost 1,000 acres of land earmarked for up to 6,000 homes and a giant factory.
Sutton MP Andrew Mitchell and members of the Project Fields campaign group led the march.
Birmingham City Council has earmarked the land, east of Walmley, for development to meet increasing demand for housing.
The proposal will go before a Government inspector at a public inquiry starting on Monday, October 20.
Project Fields spokeswoman Suzanne Webb said: “Residents were out in force.
“They are disappointed that, while they have tried to understand the position of city council in wanting to release green belt land, the authority has failed to understand the residents’ position.
“It has ignored all 5,863 comments made during consultation. If common sense prevails the green belt will be removed from the plan for development.
“But whatever the outcome we should continue to work and align as a community and with those who help and support us.”
Conservative MP Mr Mitchell, who is to speak at the public inquiry, said: “It was a bitter disappointment that the Labour council essentially ignored almost 6,000 letters written in opposition to the current plan as part of the formal consultation.
“We need to go into these public hearings with demonstrable evidence that Suttonians will not just be pushed aside on this issue, and we will fight these proposals until the very end “.
The council, which has included the proposal in its wide-ranging Development Plan, said it had no option but to develop in the green belt.
It said there was not enough urban space to meet demand for 80,000 new homes over the next 20 years.
The four-week inquiry into the Birmingham Development Plan will be held at Aston University.
The finding will be revealed early next year.