This is the brief history of the 66th (2/1st East Lancashire) Division, a peacetime Territorial division which mobilised on the outbreak of war. The podcast follows its movements and engagements from when it reassembled overseas in March 1917, through its campaigns in France and Flanders to the end of the war.
I recommend using the Long Long Trail website by Chris Baker, if you need to find out which division your chosen unit or soldier served with.