I found this bizarre and interesting:

When sultan Mehmed II besieged Constantinople, they came to a stalemate after weeks of fighting. Both armies were at the brink of collapse, demoralized. It was anyone’s guess who would win.

On the last night, a blood moon appeared. The Christians took that as bad omen and became even more demoralized. The Muslims interpreted it as a good sign and became more energized, convinced of victory and made the last push.

This “sign” was all that was needed to overtake Constantinople and end the Roman Empire.