The Russians led by Tolbuzin returned to Albazin to reap the crops. This time they built a stout
bastion fort with the help of a
Prussian military expert by the name of Afanasii Ivanovich Beiton, who had been captured in 1667 by the Russians and sent as a prisoner to
Siberia. The new walls, made of an earthen core, were reinforced with a weave of clay and tree roots, making them uncommonly strong. In July 1686, Langtan and Sapusu led 3,000 soldiers and laid siege to Albazin again. This time the Qing forces were unable to penetrate the walls despite many attempts. On 23 July, the Qing made a direct assault on the southern wall after bombardment from cannons, but were forced to retreat with heavy losses. The Russians however made several successful sallies, sometimes even taking prisoners. They became too confident at one point and fell into an ambush while trying to dismantle the enemy siegeworks. Due to the bastions and design of the fortress, the Qing were unable to gain an advantageous position to bombard the defending forces. In early August, the Qing established walls around the fort and cut off Russian access to the river. The Russians tried to prevent this but failed after fighting for four days straight. A complete blockade had been erected around Albazin by the end of August. The Russians became very sick and started dying from scurvy, typhus, and cholera. Of the 800-900 defenders who held Albazin at the beginning of the siege, no more than 150 remained alive by early November. The Qing forces too suffered heavily, although not as much as the Russians, and by November less than half of the original 3,000 remained. According to one source, the Qing killed Tolbuzin and retook the fort. Only 70 of the original defenders remained alive and half of them died to starvation and disease soon after. Thereafter, the Kangxi Emperor dispatched a message to Moscow offering trade in return for Russian withdraw from the Amur. Another source says that the siege ended following peace overtures by the Russians. In October 1686, Russian envoys from
Moscow arrived in
Beijing seeking peace. The Kangxi Emperor sent a messenger to Albazin, arriving in December, and announced a pause to the siege of Albazin. Of the 800-900 defenders, only 24 survived. They were permitted to leave the fort, buy supplies, and were provided with food and medical aid by the Qing forces. According to European sources, the Russians led by Beiton refused the aid offered and instead sent a 16 kg baked pie to the Qing commander as a present. Qing sources however say that it was Beiton himself who asked for provisions. The man who delivered the provisions returned with a dismal report of the fort's conditions, noting that only 24 Russians still lived and even Beiton himself was sick. The Qing army withdrew a distance from Albazin in May 1687 and left Albazin for
Qiqihar and
Aigun in August 1687. The Russians rebuilt their villages and cultivated the fields but were not allowed to hunt because it was viewed as infringing on Chinese sovereignty. Albazin was relinquished to the Qing in the
Treaty of Nerchinsk of 1689 in return for Russian trading privileges in Beijing. ==Aftermath==