 Complete the following phrase:  While there are many sources the number of people on crusade is unclear because they fluctuated regularly and many non-combatants on pilgrimage accompanied the soldiers. Historian Jonathan Riley-Smith offers a rough guide, suggesting that perhaps 43,000 people including soldiers, armed poor, and non-combatants were involved in the siege of Nicaea in June 1097, while as few as 15,000 may have taken part in the 