3 Answers

....one who fights against an established government or authority 

it's a person or persons whose country is under siege from a foreign country ; and they 're trying to fight back and get the invaders out...........like when the U.S. invaded Iraq and laid waist to that country. The residents were trying to fight back and take their country back and were called ........" insurgents "  or   " the insurgency " 

In any case the movement you're looking at is Tudors MT5400 a version of the MT5402 which is common to the steel Fifty-Eights that has been upsized link to better fill the aperture of the display link case back. Ticking at link 4Hz and offering 70 hours of power reserve the MT5400 is COSC-certified and backed by Tudors 5-year warranty.