A General Dynamics military plant in Taunton will probably avoid having to lay off workers after the Pentagon this week backed off a plan to cut hundreds of millions of dollars from a project being developed there.

The Defense Department’s proposal to chop $334.6 million from the project — a mobile communications system for military units in the field — was met with stiff opposition in Congress, particularly from Senator Scott Brown, a Republican. And after meeting with Brown earlier this week, Pentagon officials revised the size of the cut down to $54.6 million, his office said Friday.