Bombers were a type of aircraft used by Nazi Germany to attack the United Kingdom during the Second World War. (TV: Victory of the Daleks) The UK also used bombers, specifically the Lancaster Bomber, under the direction of RAF Bomber Command. (TV: The Doctor, the Widow and the Wardrobe)
Alternate timelines
In the history in which the Ironsides were never discovered by the Eleventh Doctor, the Japanese attack on Pearl Harbor was opposed by the Ironsides who engaged the enemy bombers in a "vicious dogfight" lasting two days. (PROSE: The Ironside Advance)