After 1853 war was declared on Russia by the Ottomans and commenced in 1854 .
Having obtained promises of support from France and Britain , the Ottomans declared war on Russia in October 1853.The war started in the Balkans in July 1853 , when Russian troops occupied the Danubian Principalities ( part of modern Romania ) , which were under Ottoman suzerainty , then began to cross the Danube .
Crimean War