This sounds a little like the brigades that the Red Army had at the start of WW2, the ones that formed the "Stalin Line", and existed throughout the war. I'm really only familiar with them from WW2 games, but they're often classed as "fortress" or "fortified area" units, dedicated to defending an area with fixed fortifications.
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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