[ojcar]

The first raids over Tokyo were about 27000-32000 ft (depending on the payload, I suppose). They were very ineffective raids. Then, Gral Hansell was substituted by Gral Le May and tactics changed. Not more High flying raids attacking strategic objetives. The raids were now at 24000 ft (the highest) or more commonly between 4900-9200 ft attacking the cities with incendiary bombs.