As one of the 'new' or revisionist Israeli historians, I have followed with interest the debate about Jewish participation in the London commemoration of the Deir Yassin massacre.
Some details are still in dispute, but the broad outlines of the story are clear.
It is very much to Israel's credit that it allows access to its official documents under the 30-year rule. These documents leave no room for doubt that the Irgun and Lehi units that attacked the Palestinian village of Deir Yassin on 9 April 1948 committed a massacre. It was probably not premeditated, but a massacre it was, and it claimed the lives of over a hundred Palestinians. Some of your correspondents would be well advised to consult Benny Morris's 1988 book, The Birth of the Palestinian Refugee Problem, 1947-1949. Morris makes it clear that there was a prolonged firefight followed by a massacre.