'Regulta' was the British movement of Brigadier C. H. Boucher’s Indian 20^th Brigade of Major General W. A. K. Fraser’s (from 15 May Major General W. J. Slim’s) Indian 10^th Division by boat up the Shatt al-Arab waterway and Tigris river to Kut during the 'Sabine' suppression of the Iraqi revolt (early May 1941).