Between 1050-1300, military expeditions (Crusades) were sent from Europe to Jerusalem to “rid” the Holy Land of “infidels,” wherein an estimated 1.7 million people, including Jews, were killed and burnt in the First Crusade alone.

Source: https://businessmirror.com.ph/2023/10/22/triumph-over-trauma/?utm_source=rss&utm_medium=rss&utm_campaign=triumph-over-trauma

For example, it is undeniable that the Crusades saw thousands of Catholics invade the Holy Land in an attempt to retake Jerusalem.

Source: https://www.ncregister.com/commentaries/how-to-battle-historical-bias-a-catholic-guide

It became a mosque in the 7th century before a new church was built in the 12th century during the Crusades.

Source: https://rapidcityjournal.com/news/nation-world/government-politics/live-updates-israel-bombards-gaza-with-airstrikes-and-readies-troops-for-a-ground-assault/article_8f94ba2f-9eac-5109-808a-1f147e94531a.html

Rav Velvel pointed to “Mi Yitein Roshi Mayim recited on Tisha B’Av that describes the destruction of the German communities of Speyer, Worms, and Mainz during the First Crusades of 1096.

Source: https://www.jewishpress.com/judaism/halacha-hashkafa/asarah-btevet-as-a-memorial-day/2023/12/20/