You may be interested in a past post on this topic:

• How common was sexual violence against women during warfare in the Middle Ages? Were there successful attempts to limit or prevent it?
  ^(23 Feb 2016 | 26 comments)
  ^(/u/sunagainstgold takes a broad look at Medieval sexual violence, including sections about Muslim women during the Crusades.)

For followup questions, use username mentions in this thread to direct questions to specific commenters.