38th (Welsh) Division attacked Mametz Wood, France, 1916
This was the first major action fought division, which included the 13th, 14th, 15th, 16th and 17th Battalions. The first attack on the 7th July failed. A second one was made on the 10th. There was heavy fighting throughout the day at very close quarters in the wood. When relieved on the 12th the division had lost 4,000 men, and the Royal Welch Fusiliers well over 1,000, including four out of five commanding officers.