In 1914, the First World War broke out. In 1917, France, France, Italy and other European countries formed an alliance and were determined to fight Germany together. Many ambitious young people volunteered to join this unprecedented war on the European continent, hoping to end the war through their own meager efforts and let everyone live a peaceful and quiet life again. Brian (James Franco), who lost his family ranch, William, who wanted to restore the glory of his family, Briggs, who wanted to travel across the Atlantic, and black boxers who were expelled from the United States for racial reasons, and other 38 young people joined the overseas combat air force for a common goal. Under the assistance and leadership of French General Senault (Jean Reno) and American soldier Reed Cassidy (Martin Henderson), everyone truly understood the meaning of fighting for honor and peace, and all formed the "Lafayette Flying Squadron". But the cruelty and reality of war far exceeded the imagination of this group of passionate young people. Death is approaching every day, and danger is everywhere...