U-M in History — May 4-25 May 4, 2020 Estimated reading time: 1 minutes On May 19, 1972, students dug bomb craters on campus to protest the Vietnam War. Read about some of the other things that happened in U-M history during the weeks of May 4-25. Click the photo and expand your browser window to view a larger version. Topics: History This Week In U-M History