Rubuta ci gaba don wannan sakin layi - 3rd Battalion, 5th Marines, tare da sauran 5th Marine Regiment, an fara shirya su a ranar 8 ga Yuni, 1917, yayin da Amurka ke shirin shiga Yaƙin Duniya na 1. Battalion ya ƙunshi kamfanoni huɗu: "16th", "20th", "45th" da "47th". Kwana shida bayan haka, da sojoji na Spanish-American War da Boxer Rebellion tare da adadi mai yawa na sabbin ma'aikata, sun tashi zuwa Faransa. Sun halarci kamfen da yaƙe-yaƙe kamar Bois de Belleau
, Vierzy, Château-Thierry, Pont-a-Mousson, Limey Sector, Fleury, Meuse-Argonne, Blanc Mont, St Michiel, Leffincourt da kuma Soissons. Gwamnatin Faransa ta amince da matashin bataliya ta hanyar gabatar da ita Croix de guerre tare da Fourragère da kuma canza sunan wata alama ta Faransa, Belleau Wood, zuwa "Bois de la Brigade de Marine" ko "Wood of the Marine Brigade".