This Tuesday is the fast of Asarah B'Tevet
And it was in the ninth year of his reign, in the tenth month, in the tenth day of the month, that Nebuchadnezzar, King of Babylon came, he and all his hosts, upon Jerusalem, and he encamped upon it and built forts around it. And the city came under siege till the eleventh year of King Tzidkiyahu. On the ninth of the month famine was intense in the city, the people had no bread, and the city was breached.
Second Kings 25
Read an excellent essay by Rav Bar Tzadok HERE
Another great essay can be found HERE
Have an easy fast!