Now regarding Osman Nuri Pasha, citing from Wikipedia:
He served in Crimea, where his bravery secured him a promotion as First Lieutenant. After the end of the war (February 1856), Osman was appointed to the General Staff and,
a year later (1857), had risen to the rank of Captain with the title of Bey. In 1859 he was appointed as a military representative in the forming of the cadastral and census map of the Ottoman Empire, a job he fulfilled for the next two years.
In 1861, Osman was sent to Beirut Vilayet, where a rebellion had been started by Yusuf Ekrem in Syria.
I wonder if it was the same. But then the years won't match as in 1868, he was promoted to the rank of Major-General with the title of Pasha...
Or may it be Osman Hamdi Bey?
On the other hand, I assume Osman was quite a common name in the Ottoman army and there might heve been another one with the title of Bey.