2. Engaged on March 21, the division advanced by Doignies and Herrnies. It passed to rest on the 24th and was reengaged from March 26 to April 6 at Miraumont, Hebuterne, and Colincamps. The division suffered very heavy losses in the engagement. 3. Relieved from the Hebuterne front on April 6, the division rested two weeks in the Bapaune-Cambrai area. The division moved north to the Lys front via Douai-Lille. BATTLE OF THE LYS. 4. The division was in line west of Merville from April 23 to May 14. 5. While at rest north of Tournai, the division was reconstituted and prepared for another heavy engagement. 6. The division entrained for Loos on June 30 and moved on to Sailly sur la Lys on July 18. THE LYS WITHDRAWAL. 7. The division came into line near Merris on July 27. It lost 500 prisoners south of Meteren on August 18. On the 30th the division fell back on Bailleul and later to Bac St. Maur and Fleurbaix. It was relieved at Fleurbaix on October 11. 8. The division rested from the 11th to the 21st near Denain. 9. Again the division was engaged to the east and northeast of Solesmes and near Le Quesnoy, retreating to Beaurain, Ghissignies, and Ruesnes. It passed in the second line on November 1, but came back to the line south of Le Quesnoy about November 5. It retreated by Locquignol toward Maubeuge, where it was last identified on November 9. VALUE—1918 ESTIMATE. The 4th Division was a very good division. In 1918 its morale was mediocre, due to the young recruits. 4th Ersatz Division. COMPOSITION.