[1] Ibbi-Sin ordered fortifications built at the important cities of Ur and Nippur, but these efforts were not enough to stop the raids or keep the empire unified.

In 2004 or 1940 BCE, the Elamites, along with "tribesmen from the region of Shimashki in the Zagros Mountains"[2] sacked Ur and took Ibbi-Sin captive; he was taken to the city of Elam where he was imprisoned and, at an unknown date, died.

[...] Any damage to the agricultural system by enemy raids, bureaucratic mismanagement, or an inattentive ruler would result in food shortagesIn years seven and eight of Ibbi-Sin's kingship, the price of grain increased to 60 times the norm, which means that the success of the Amorites in disrupting the Ur III empire is, at least in part, a product of attacks on the agricultural and irrigation systems.

These attacks brought famine and caused an economic collapse in the empire, paving the way for the Elamites under Kindattu to strike into Ur and capture the king.

The Lament for Sumer and Ur describe the fall of Ur and the fate of Ibbi-Sin: An, Enlil, Enki and Ninhursaja have decided its fate -- to overturn the divine powers of Sumer, to lock up the favourable reign in its home, to destroy the city, to destroy the house, to destroy the cattle-pen, to level the sheepfold; (...) that Shimashki and Elam, the enemy, should dwell in their place; that its shepherd, in his own palace, should be captured by the enemy, that Ibbi-Sin should be taken to the land Elam in fetters, that from Mount Zabu on the edge of the sea to the borders of Ancan, like a swallow that has flown from its house, he should never return to his city"All the year names of Ibbi-Sin are known, documenting the major events of his reign.

Year: "Ibbi-Suen, the king of Ur, overwhelmed Susa, Adamdun and Awan like a storm, subdued them in a single day and seized the lords of their people" 17.