Hiroshima was the target of the first weapon at 8:15 AM on 6 August 1945.
Hiroshima and Nagasaki are the two Japanese cities that the United States dropped atomic bombs on during (and to end) the Second World War. 1. These aren't necessarily "battles". 2. They happened at the cities that are named in your question.
FDR's place.
Oahu Hawaii
Himmel Street
December 7, 1941.
7th of December 1941
After massive bombing raids had already devastated the Japanese home islands, the final impetus was the dropping of two atomic bombs on Japan, virtually destroying the cities of Hiroshima and Nagasaki. Japan agreed to surrender just six days after the second bombing.
The atomic bombing of Nagasaki, Japan by the United States took place on August 8, 1945. The US believed that the dropping of atomic weaponry on two cities would shock the Japanese into surrendering (it did). The logic was "We'll take a few hundred thousand lives to save millions more". Japan surrendered a little over a month later, on September 15, 1945.
August 6, 1945. The second bomb was dropped three days later on August 9.
the big US aerial bombing that took place on Christmas day.
Yes. The bombing of Guernica was part of the Spanish Civil War.