The 38th (Irish) Infantry Brigade came into existence on 13 January 1942 by the re-designation of the 210th Independent Infantry Brigade (Home), a Home Defence formation organised in October 1940. The 210th Brigade had been serving in Dorset County Division. When that division was disbanded on 24 November 1941, 210 Brigade transferred to the 1st Infantry Division. By then, all of 210 Brigade's English home defence battalions had been posted away and were replaced by the 1st Battalion, Royal Irish Fusiliers, the 6th Battalion, Royal Inniskilling Fusiliers and the 2nd Battalion, London Irish Rifles. Of the three battalions, only the 1st Royal Irish Fusiliers had seen active service, fighting in the Battle of France where they were forced to retreat to Dunkirk and were subsequently evacuated to England.