Despite the distraction of the ongoing World War, troops from thirteen nations were involved in the Russian Civil War, fighting over a variety of goals and objectives. Among those was the United States, which had troops fighting in the bitter Russian cold even after the war in Europe came to an end.
The Reconquista, or Christian reconquest of Iberia, took nearly 800 years. The fighting did not come without great attempts by Muslim powers across the strait trying to reestablish their presence in mainland Europe. The last gasp of that effort came in the 1330s, when the powerful Marinid sultanate of what is modern Morocco invaded in an attempt to reverse Christian gains and secure the perilous position of the Sultanate of Granada.