From 1940 to 1947, Waziristan and indeed most of the Frontier remained relatively calm and the British were able to divert most of their military effort to more important theatres. There were, however, brief periods of trouble on the frontier, which required the British to continue to maintain a military presence in the region, although for the main they were able to employ mainly garrison or rear-area troops during this time, thus allowing them to free up front-line units for active service elsewhere.