"When Johnny Comes Marching Home" is a popular American Civil War song written by Louis Lambert in 1863. The song expresses the joy and relief of families and communities as soldiers return home from war. Its catchy melody and heartfelt lyrics made it a favorite among both soldiers and civilians during the conflict. The song reflects the broader themes of patriotism and the emotional toll of war. It captures the hope for peace and the celebration of returning heroes, symbolizing the longing for loved ones and the desire for a united nation after the hardships of the Civil War.