Cause:
From 1830 onwards there was a growing estrangement between Great Britain and Russia. The Czar Nicholas believed that the dominion of the Turk in Europe was nearing its end, and cherished the ambition that Russia should acquire provinces of the Ottoman dominions. On the other hand, there was keen opposition in Great Britain to Russia’s expansion, and to the idea of Constantinople falling into her hands. Louis Napoleon had only two years previously become Emperor of the French. His dynastic ambitions made him eager for military glory. Sardinia joined the Allies for tactical reasons.