Arjay--I was caught out on a John Deere 4020 while pulling a harrow in a hail storm like that 40 years ago. My truck and the nearest shed, tree, or cover of any kind was a mile or two away. I had no choice but to shut down and get under the tractor. Horrifying experience. I can't imagine being under an artillery barrage, that was the closest thing I can imagine to the experience.
I am glad you are safe and ok--all the stuff can be replaced--that's why you buy insurance (hopefully)!