World War I
The 1-120th FA, as part of the 57th Field Artillery Brigade continued its training with the 32d Infantry Division at Camp Mac Arthur until February 1918. The entire division was then ordered to Europe. The 120th Field Artillery Landed at Liverpool, England and then traveled by rail to South Hampton and across the English Channel to Le Havre, France.
In France the 120th trained at Camp De Coëtquidan, an old French Artillery Camp. It was here that it was equipped with French 75's and horses. Shortly before the 57th Brigade was ordered to the front in Alsace, the 2nd Battalion of the 120th was sent to Saumur, France with its batteries acting as training batteries for the Saumur Artillery School. The balance of the Battalion arrived in Belfort with the 57th Brigade on 8 June and marched to the front as a part of the 32nd Division, for the first time since leaving Camp MacArthur.
The 120th Field Artillery went into action in the Château-Thierry sector on 1 August 1918 near Rancheros in support of the 32d Division. After the 32nd Division had taken Juivgay, the 32nd Division was relieved by the 2nd Moroccan Division, which included the famous "French Foreign Legion". The 120th FA remained in the line in support of the Foreign Legion and helped blast a path for the charge of the Foreign Legion. The 120th, along with the 57th Brigade, was congratulated for the part they played in this action by the Commanding General of the 1st Moroccan Infantry Division, General Panot, and by French Corps Commander, General Charles Mangin.