The Qajar state weakened the Ottoman's eastern defense lines with its victory in the Battle of Erzurum, and it turned this advantage into a plan to expand towards Mesopotamia.

[1][7] Following their victory at the Battle of Erzurum (1821), the Qajar army, under Dowlatshah (Mohammad Ali Mirza), advanced into Mesopotamian Ottoman territories and laid siege to Baghdad in 1821.

The Qajar Dynasty, with support from Russia, sought to extend its influence over Mesopotamia, which was crucial for controlling vital trade routes and strengthening their position against the Ottoman Empire.

However, as the siege continued, it became evident that the Qajar forces were struggling to maintain the momentum of their initial assault, especially as the region's harsh conditions, coupled with logistical challenges, took their toll on their army.

Dawud Pasha's leadership during this critical period was instrumental in securing Baghdad, and his ability to hold the city against overwhelming odds was a testament to the strength of the Ottoman military presence in the region.

Additionally, this event marked a key turning point in the ongoing conflict between the Ottoman Empire and the Qajar Dynasty, with both sides continuing to vie for control of strategic territories in the following years.