Battle of Samarra
The Battle of Samarra was the key engagement between the two great generals Nader Shah and Topal Osman Pasha, which led to the siege of Baghdad being lifted, keeping Ottoman Iraq under Istanbul's control. The armed contest between the two colossi was very hard fought, with a total of roughly 50,000 men becoming casualties by the end of the fighting that left the Persians decimated and the Ottoman victors badly shaken. Other than its importance in deciding the fate of Baghdad, the battle is also significant as Nader's only battlefield defeat although he would avenge this defeat at the hands of Topal Pasha at the Battle of Kirkuk, where Topal was killed.