The 10th of Tevet: Biblical Siege of Jerusalem
https://asknoah.org/wp-content/uploads/RabbiEisen_10thTevet_1-59.mp3
Rabbi Yosef Eisen gives a short audio lecture on the history of the Tenth of Tevet, when the Babylonians laid siege to Jerusalem.
The 10th of Tevet in the Hebrew calendar can occur from mid-December to early January. In 20’21, it falls on December 14.