The Don and Zaporozhian Cossacks stormed the fortress in June 1637.
Cossack cavalry with the strength of 400 horsemen defended the fortress from steppe side.
Turkish army attempted to retake Azov in 1641.
The fortress sustained heavy shelling by guns that reduced much of the fortress to rubble.
Turks spent 700-1000 shells per day.
The walls were completely destroyed in parts.
Only three towers among 11 were spared during the battle.
Forces of Ottoman Empire stormed the fortress, but they sustained heavy losses and retreated.
After the gun-fire forces of Ottoman Empire organized a massive attack against the fortress.
Outnumbered Turkish Army forced the cossacks to retreat to the Citadel.
Siege of Azov ends due to heavy toll (20–70 thousand wounded or killed  in three months) problems with Turkish army support and supply of the provisions.

The Cossacks  proposed the annexation of Azov by the Tsardom of Russia.
Russian tsar Michael I and the zemsky sobor refused the offer because it has resulted in next Russo-Turkish war to which Russia was not ready.
The cossacks  did not have resources to the reсonstruction of the fortress.
That is why blasted and desolate fortress was left in the summer of 1642.
See also Bahadır I Giray.
The Don and Zaporozhian Cossacks stormed the fortress in June 1637. Cossack cavalry with the strength of 400 horsemen defended the fortress from steppe side. Turkish army attempted to retake Azov in 1641. The fortress sustained heavy shelling by guns that reduced much of the fortress to rubble. Turks spent 700-1000 shells per day. The walls were completely destroyed in parts. Only three towers among 11 were spared during the battle. Forces of Ottoman Empire stormed the fortress, but they sustained heavy losses and retreated. After the gun-fire forces of Ottoman Empire organized a massive attack against the fortress. Outnumbered Turkish Army forced the cossacks to retreat to the Citadel. Siege of Azov ends due to heavy toll (20–70 thousand wounded or killed  in three months) problems with Turkish army support and supply of the provisions.
The Cossacks  proposed the annexation of Azov by the Tsardom of Russia. Russian tsar Michael I and the zemsky sobor refused the offer because it has resulted in next Russo-Turkish war to which Russia was not ready. The cossacks  did not have resources to the reсonstruction of the fortress. That is why blasted and desolate fortress was left in the summer of 1642. See also Bahadır I Giray.
Azov Fortress