See the following articles in Biblical Archaeology Review: Mordechai Cogan, “Sennacherib’s Siege of Jerusalem,” January/February 2001; William H. Shea, “Jerusalem Under Siege: Did Sennacherib Attack Twice?” November/December 1999; Dan Gill, “How They Met: Geology Solves Longstanding Mysteries of Hezekiah’s Tunnelers,” July/August 1994.