Yes, the Queen of England can decide to declare war. She can do a few other things like appoint ministers to the crown, issue passports, legitimize laws, and pardon miscreants.
The process of declaring war might be a bit less straightforward than you think. The reason for announcing war within the English realm must be sound, and the command must be screened and thoroughly debated.
Can Queen Elizabeth II declare war?
The Queen is the first in command and the ultimate governing power in the United Kingdom but to declare an act of mass chaos like war, the decision would have to run through complex chains of command. Thus, the other arms of government; are the parliament, the government, and the Prime minister.
She might have some levels of power but she’s still under the law which favors not only her family but the other million families residing in England.
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