Destruction of the Second Beit HaMikdash
After fighting for Jerusalem and for their lives, the Romans breached the walls of Jerusalem on the 17th of Tammuz. On the 9th of Av, the Beit Hamikdash was set aflame, burning through the 10th. Jews were murdered, exiled, and sold as slaves.
By David Roberts - http://jerusalem.nottingham.ac.uk/items/show/62, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3267412