In the United States, the suppression of the Boxer Rebellion was known as the China Relief Expedition .  The United States was able to play a major role in suppressing the Boxer Rebellion largely due to the presence of American forces deployed in the Philippines since the US colonisation after the Spanish–American War in 1898.  Of the foreign troops under siege, there were 56 American Sailors and Marines from the USS Oregon and USS Newark .  The main American formations deployed were the 9th Infantry and 14th Infantry regiments, elements of the 6th Cavalry regiment, the 5th Artillery regiment, and a Marine battalion, all under the command of Adna Chaffee .   Future President Herbert Hoover and Mrs. Lou Henry Hoover were living in the foreign compound during the siege when Mr. Hoover was working for the Chinese Engineering and Mining Company. Mr. Hoover helped erect barricades and formed a protective force of the able bodied men. Mrs. Hoover helped set up a hospital, nursed the wounded, set up a dairy, took part in the night watch, took tea to sentries and carried a Mauser .38 semi-automatic pistol.