Both the 4th and 7th battalions served in the North West Europe Campaign after the Normandy landings on 6 June 1944, D-Day. The division fought very well in the Battle of Normandy, particularly so during the Battle for Caen in Operation Epsom in late June, at the Battle for Hill 112 (Operation Jupiter). During the battle, "the 4th Somersets suffered 556 casualties out of a strength of 845. Between 26 June and 14 July, 4th SLI received 19 reinforcement officers and 479 ORs as replacements." The battalion became involved in trench warfare similar to that of the Great War. They later played a large part in the disastrous Operation Market Garden, a small role in the Battle of the Bulge and finally took part in Operation Plunder, the crossing of the River Rhine by the Allies.