We assumed they read a bunch of our lower tier codes, and the Germans (specifically Deutsche Afrika Korps) completely dominated in radio direction finding and traffic analysis, which was in many ways more important than decrypts (and largely considered more sensitive from an ongoing security perspective after the war, so not as publicized.)

Nachrichten-Fern-Aufkl-Kp 621 and Hauptmann Alfred Seebohm were pivotal for DAK actions. There were some similar units on other fronts, but this one was particularly well documented.