I refrain from food or drink until sunset.
Siege of Jerusalem (425 BCE)
On the 10th of Tevet of the year 3336 from Creation (425 BCE), the armies of the Babylonian emperor Nebuchadnezzar laid siege to Jerusalem. Thirty months later -- on Tammuz 17, 3338 -- the city walls were breached, and on Av 9th of that year, the Holy Temple was destroyed. The Jewish people were exiled to Babylonia for 70 years.