 Soon after arrival of the division, it became part of BEF policy to integrate Regular Army units into Territorial Army formations and so the 4th Battalion, Royal Berkshire Regiment was exchanged for the 2nd Battalion, Gloucestershire Regiment, a Regular battalion, from the 8th Infantry Brigade of the 3rd Infantry Division.The brigade, with the rest of the 48th Division, fought in the battles of Belgium and France, and at the battle of the Ypres-Comines Canal and had to retreat to Dunkirk be evacuated to England after the German Army threatened to cut off the entire BEF from the main French Armies.Following its withdrawal from France (where the 4th Ox and Bucks was surrounded and virtually destroyed as a fighting force near Watou) the brigade was reformed, as with most units that had fought in France, with large numbers of men who had been conscripted.