A list of historical events that take place in the universe of Once Upon a Time.
“"Operation Cobra" is the name given to the "adventure" Henry Mills embarked on to get his...Operation Cobra
“For the episodes, see Operation Mongoose, Part 1 and Operation Mongoose, Part 2. "Operation...Operation Mongoose
“"Operation Firebird" is the name given to the heroes' mission to help the lost souls of the...Operation Firebird