Absence from work or duty without permission:the caretaker had taken French leave...
I wouldn't get too worked up about this, you might have to take French leave to sort it out.
I'm beginning to think you took a French leave from the Rangers.
Origin
Mid 18th century: said to derive from the French custom of leaving a dinner or ball without saying goodbye to the host or hostess. The phrase was first recorded shortly after the Seven Years War; the equivalent French expression is filer à l'Anglaise, literally 'to escape in the style of the English'.