The main U.S. troop combat in Russia was the American intervention in North Russia and Siberia during the Russian Civil War in 1918–1920. U.S. soldiers fought Bolshevik forces near Archangel in north Russia and also served in Siberia as part of the broader Allied intervention.

What it was

  • In north Russia, American units were involved in combat around Archangel against Bolshevik forces.
  • In Siberia, U.S. forces were also deployed during the Russian Civil War as part of the Allied intervention.

Common name

  • The north Russia mission is often called the Polar Bear Expedition.
  • It is one of the lesser-known U.S. military interventions in Russia.

Quick context

  • This was not a modern U.S.-Russia war.
  • It happened after World War I, during the chaos of the Russian Civil War.

TL;DR: If you mean a historical battle, the best-known answer is the American intervention in North Russia, especially around Archangel, and the Siberian intervention.