Myrmidon is a noun that means a subordinate who carries out orders without question.
In Greek mythology there’s a tale about a group of warriors from Thessaly (THES a lee) who accompanied Achilles to Troy. When using mymidon today, a person doesn’t have to be especially warlike to earn the title. They must simply be a subordinate who takes orders without regard for moral consequences.
I don’t think it was Marie who was responsible for slashing my tires. It’s more likely that the task was done by one of her mymidons.