Answer:
The Crimean War was fought between Russia and the forces of Britain, France, and the Ottoman Empire, later joined by the army of Sardinia.
Step-by-step explanation:
The Crimean War broke out on 5th October 1853, a military conflict fought between the Russian Empire on one side, against an alliance of Britain, France, the Ottoman Empire and Sardinia.
The spark that set off the war was religious tension between Catholics and the Orthodox believers, including Russians, over access to Jerusalem and other places under Turkish rule that were considered sacred by both Christian sects.