[2] She was one of the leading excavators at Gergovia in 1930 which expanded knowledge of Gallic oppida, however this work was interrupted by the Second World War.
[2] Following the war, Brogan started work at Sabratha in Northern Libya, where she was the chief supervisor under the directorship of Kathleen Kenyon from 1948 to 1951.
[2] Brogan excavated in Libya nearly every year from the 1950s to 1974,[3] particularly in Tripolitania at sites Lepcis Magna with John Ward-Perkins.
[3] Brogan excavated the site alongside Emilio Vergera-Cafarelli and David Smith over four seasons.
She also worked in Tunisia, Algeria and Morocco[3] and in the 1970s, Brogan produced a publication of a previously unknown 6 km long Roman linear barrier made of stone wall and bank and ditch.