I think Hiroshima and Nagasaki (Tokyo was actually a target but overcast on one of those days) paid the butcher's bill on that.
I just want to see the Chinese reaction .... they're probably going to S%^& themselves when Japan has carriers AND nukes.
Commanded by Major Charles Sweeny, Bocks Car and its accompanying aircraft took off from Tinian Island and headed for its primary target, an arsenal in the middle of the industrial city of Kokura. Arriving over Kokura, it was determined that the bombardier could not clearly identify the target due to heavy smoke and haze. The bombardier was under strict orders not to drop the bomb by radar ; a visual approach had been mandated by General Groves.There was a conventional raid on Tokyo which caused more fatalities than either atomic raid. Curtis LeMay noticed that unlike the Germans the Japanese had very little triple-A and none that worked at higher altitudes. He also noticed that Japanese cities had exceptionally high fuel loading - combustables per square mile. An incinderary raid from 15,000 feet was like tossing a match into a haystack.
Two more [attempts] which took about 55 minutes, were made to locate the target but to no avail. It was then decided between the weaponeer and Major Sweeny to divert to the secondary target which was Nagasaki. Arriving over Nagasaki quite low on fuel, it was determined that Bocks Car could make only one pass before it had to head back to Tinian Island. Again, clouds obscured most of the city, but at the last minute an opening revealed the target point and Captain Kermit Beahan dropped the bomb visually at 11:58.
See also, "When can we have that bomb?