March on Nineveh

In April or May 612 BC, at the start of Nabopolassar's fourteenth year as king of Babylon, the combined Medo-Babylonian army marched on Nineveh. From June to August of that year, they besieged the Assyrian capital and in August the walls were breached, leading to another lengthy and brutal sack during which Sinsharishkun is assumed to have died.