To shore up the Sultan? Abhorrence.
To halt Russian expansion
(As told here with scansion),
Combattants' blood flowed there in torrents.
The Crimean War (1853–1856), a major setback for Russian expansionism in the Black Sea and adjacent areas, was part of a series of Russo-Turkish Wars that proceeded intermittently for centuries as the Ottoman Empire deteriorated. British and French assault on Russian forces temporarily shored up the 'sick man of Europe', and provided a venue for the establishment of modern nursing practices under the auspices of Florence Nightingale.