1900-2000 (GCSE History), A-Level / IB History “The Yom Kippur war was caused by the Israelis and ended with their utter defeat” – do you agree? Posted by Russel Tarr on December 3, 2013June 21, 2013 By: Alan Kotok A sample sourcework assignment, complete with model answers, in the style of the IB History Paper 1.