While leading a sortie Cleland was shot dead, and was buried in the churchyard.
Calling a council of war on the heights of Fort St Julien, he asked the opinion of his subordinates, who were unanimously against the proposed sortie, principally because the artillery "had only ammunition enough for a single battle!"
But a sortie of the garrison of Astrakhan drove back the besiegers; 15,000 Russians, under Knes Serebianov, attacked and scattered the workmen and the Tatar force sent for their protection; and, finally, the Ottoman fleet was destroyed by a storm.
He served in the first siege, at the battle of Tudela, and during the second siege until he was taken prisoner in a sortie.
In September 1825 Ibrahim, at the order of the sultan, had joined Reshid before the town; piecemeal the outlying forts and defences now fell, until the garrison, reduced by starvation and disease, determined to hazard all on a final sortie.