Here are five worksheets on the homophones marshall and marshal used, respectively, as a noun and a verb. The verb, particularly, strikes me as something high school students should know, particularly if teachers are assigning research papers and asking students to marshal evidence to support arguments.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.