How did Jonathan frisby dies?

In "Mrs. Frisby and the Rats of NIMH" by Robert C. O'Brien, Jonathan Frisby dies in an accident while attempting to move the family's home to protect them from a plow. He is killed by a farmer's tractor, leaving his wife, Mrs. Frisby, to care for their children and face the challenges of their life in the field. His sacrifice sets the stage for the story’s exploration of bravery and survival.