I wonder if that was actually a myth to hide the fact that he had inside collaboraters. The priests of Marduk in Babylon hated Nabonidis due to his abandonment

I wonder if that was actually a myth to hide the fact that he had inside collaboraters. The priests of Marduk in Babylon hated Nabonidis due to his abandonment of Marduk worship and making another city his headquarters. It may have been more acceptable to the population to tell them that the Persians diverted a river at night and entered rather than saying the gates were opened by insiders.