In 1917, Pierce became an aide to
United States Secretary of War Newton D. Baker. On one occasion after the declaration of war, when Pierce appeared before the
Senate Finance Committee to discuss how to spend the three billion dollars requested to send to the
War Department, he declared: "Clothing, cots, camps, food, pay … And we may have to have an army in France!". "Good Lord!" said
Virginian Senator
Thomas S. Martin. "You're not going to send soldiers over there, are you?" Pierce became the Director of Purchases for the
War Industries Board after its establishment in 1917. inspects American soldiers of the 108th Regiment, with the 27th Division, 6 August 1918. From left to right: Brigadier General McMullen, Chief of Staff, XIX British Corps;
aide-de-camp to Lieutenant General Sir Herbert Watt GOC XIX Corps; Lieutenant General Sir
Herbert Watts; Brigadier General Palmer E. Pierce, commanding 54th Brigade, 27th Division; Major General
John F. O'Ryan, the 27th Division commander, and King George V. In the later half of 1917 to the early part of 1918, Pierce served as commander of the
27th Infantry Division and the
54th Infantry Brigade. While he was under British command, he was ordered to the Battle of Bellecourt; there the Australians provided invaluable supplies and lessons, including hot meals to the front lines, given the lack of supplies on the front line. In late 1918, he became the Assistant Chief of Staff of the AEF. He was promoted to
brigadier general and earned two
Army Distinguished Service Medal and the British
Order of the Bath for his actions as the commander of the respective formations. The citation for his Army DSM reads: == Death and legacy ==