When the TF was reconstituted as the Territorial Army (TA) in 1920, the City of Dundee Fortress Engineers reformed at the Drill Hall in Bell Street, Dundee.
With the recognition of the increased threat of aerial bombing in any future war, the company was converted into an Independent Anti-Aircraft (AA) Searchlight Company in 1934 as 320th (City of Dundee) AA Company, RE.