The work is written in Hebrew. Its author is unknown and it deals primarily with the Crusaders' actions in Mainz; hence the name commonly applied to it. However, it also deals with the ShUM-cities in the Rhineland, specifically Speyer and Worms. It is not entirely accurate: it has a definite Jewish point of view and fictionalizes anecdotes occasionally to make a point. It also includes occasional anguished supplications to God.
References and further reading 
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- Robert Chazan, European Jewry and the First Crusade (California, 1987).
- Robert Chazan, In the Year 1096: The First Crusade and the Jews (JPS, 1996).
- A. M. Habermann, גזרות אשכנז וצרפת [Massacres of France and Germany, Hebrew] (c. 1945).