Orders is Orders by L. Ron Hubbard
"The doomed city of Shun-kien poured flame–torn billows of smoke skyward to hide the sun. Mile after square mile spread the smoldering expanse of crumbling walls and corpse–littered streets.
"And still from the Peiping area came the bombers of the Rising Sun to further wreck what was already ruined. Compact squadrons scudding through the pall Of greasy smoke turned, dived, zoomed, leaving black mushrooms swiftly growing behind their racing shadows. . ."