That image is a still from this YouTube video, Bill Warner, PhD: Jihad vs Crusades. There have been several posts in this sub on the video and similar claims. Not discouraging further discussion here, but you can get started on these posts

• Given the recent uptick in Jihad versus Crusade comparisons, i've seen this image a lot, what does it ACTUALLY show? <-- on this video specifically; featuring /u/shlin28

• What Caused the Crusades? - featuring /u/jukeboxhero, but also including links to several more (including one above). If you're interested in understanding more about why the Crusades happened, don't miss the last link, Who started the Crusades? (Each one) featuring /u/Ambarenya

• Were the Crusades a defensive move? - more from /u/jukeboxhero

These posts have been archived by now, so if you have follow-up questions for any of the users, ask them here & include their username to notify them