You obviously don't understand what an "EU Army" means.

It's not that you hand over your army to the EU and they decide what to do with it, iow that you relinquish "sovereignty" over your armed forces and/or foreign policy.

The EU Army would be controlled by its member states, not by "unelected bureaucrats" / Warlords moving pins around a map in Brussels. The fact that you even can entertain such a preposterous idea shows how badly misinformed you are. Why the fuck would any country agree to that?

When the UK joins a UN peacekeeping force, do you think that is relinquishing our sovereignty too?