The 9th (Highland) Infantry Division was an infantry division of the British Army, formed just prior to the start of the Second World War. In March 1939, after the re-emergence of Germany as a significant military power and its occupation of Czechoslovakia, the British Army increased the number of divisions in the Territorial Army (TA) by duplicating existing units. The 9th (Highland) was formed in August 1939, as a second-line duplicate of the 51st (Highland) Infantry Division. The division's battalions were all raised in the Scottish Highlands.