United States fought against Spain in 1812.
So, your answer is Spain
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Answer: He was younger than 14 and had to wait on officers and was assigned to have a gun to carry a cartridge.
My personal opinion would probably be a nurse. The reason being is even if I was not allowed to physically help out in the war, I would still feel like I was making a difference.
Yes, technically it is true that the Byzantine emperor, who believed that Muslims posed a threat to Christian Constantinople, requested help from Europe, although he mostly dealt with them himself.