calling in artillery on your own position is certainly a tactic, though, if they had this kind of spell waiting in their back pocket, how the hell did they get captured?
Link to the actual comic and not just the site itself https://www.lightroastcomics.com/comics/the-last-word
A nice alternative to the eighty pounds of black powder and 40 pounds of roofing nails concealed in one's petticoat.