This phrase for the Queen suggests that the Queen is the ruler of all the empires but when she sees her own men who were fighting for her glory and rule injured, she becomes a nurse to them and brings them back to health.
The phrase "Queen of empires" depicts America’s eminence, and "nurse of arms" refers to the skill of its soldiers in using weapons. It could also mean that Americans are better equipped to be custodians of arms as they would use them with more responsibility.
