The two Pals battalions raised by Barnsley were formed as the 13th (1st Barnsley Pals) and 14th (2nd Barnsley Pals) Battalions of the York and Lancaster Regiment. These two Pals battalions were brigaded with the Sheffield City Battalion (12th Battalion of the York and Lancaster Regiment) and the Accrington Pals (11th Battalion, East Lancashire Regiment) in the 94th Brigade of the 31st Division. Both Barnsley Pals battalions took part in the attack on Serre on the first day of the Somme campaign. The 31st Division suffered 3,600 casualties and failed to achieve any of its objectives. The Barnsley Pals were the two reserve battalions for the Sheffield City Battalion and the Accrington Pals. The 1st Barnsley Pals suffered 275 casualties while the 2nd Barnsley Pals suffered 270 casualties on 1 July 1916
The full story of the 1st and 2nd Barnsley Pals is told in Jon Cooksey's excellent "Barnsley Pals", published by Pen & Sword Books.