In AF 262, Lord Mayor Verrifant betrayed the City to the Great Houses by opening the Uptime Gate to Lady Mantissa's fleet of timeships. The timeships appeared in Snakefell District as behemoths, with mouths the size of city blocks. and began devouring citizens whole. Once inside, the citizens were no longer protected by the City's state of grace, and were killed.
Some person or group — possibly Compassion herself — took control of all of the City's (normally useless) weapons stockpiles, and used them all on the timeships simultaneously, turning the City's state of grace off momentarily during the impact. This killed twenty-million citizens, and only stunned the timeships, but Compassion then completely excised the section of Snakefell District from her interior, and threw it into the universe immediately before the Big Crunch. All but eleven of the timeship pilots were able to escape alive. The citizens who had been killed were promptly resurrected again. (PROSE: The Book of the War)