EU je početkom decembra 2004. otpočela svoju najveću zajedničku vojnu operaciju, kad je preuzela nadležnost od NATO-a za osiguranje bezbjedne i sigurne sredine u BiH i nastavak poštovanja Daytonskog mirovnog sporazuma u zemlji.
The EU mounted its largest joint military operation ever in early December 2004, when it took over responsibility from NATO for ensuring a safe and secure environment in BiH and the country's continued compliance with the Dayton Peace Agreement.