
The B-26 Marauder was the first American bomber to strike back at the Japanese after Pearl Harbor! B-26 Marauder/B-25 Mitchell. In February 1942, the 22d Bombardment Group was ordered to Australia, being assigned to bases around Townsville. The B-26 first entered combat on 5 April 1942, when the 22nd Group took off from their bases in Queensland, refueled at Port Moresby, and then attacked Japanese facilities at Rabaul. Each B-26 had a 250-gallon bomb bay and carried a 2000– pound bombload. The Marauder was the only medium bomber available in the Pacific, and generally, no fighter escort was available leaving the Marauders were on their own if they encountered enemy fighters. There were two groups equipped with B-26s, the 22nd and 38th, with two squadrons of the 38th Bombardment Group (69th and 70th) equipped with B-26s. In this series of attacks on Japanese-held facilities in the Dutch East Indies, the B-26s gained a reputation for speed and ruggedness against strong opposition from Japanese Zero fighters. Attacks on Rabaul ended on 24 May, after 80 sorties had flown. A series of unescorted raids were made on Japanese installations in the Lae area. These raids were vigorously opposed by Zero fighters. In the 84 sorties flown against Lae between 24 April and 4 July 1942, three Marauders were lost. As the Allies pushed northward in the South Pacific, temporary airfields had to be cut out of the jungle and these runways were generally fairly short. The North American B-25 Mitchell had a shorter takeoff run than the B-26, and it began to take over the medium bomber duties. Although it was admitted that the B-26 could take greater punishment, was defensively superior, and could fly faster with a heavier bomb load, the B-25 had better short-field characteristics, good sortie rate, and minimal maintenance requirements. In addition, the B-25 was considerably easier to manufacture and had suffered from fewer developmental problems. At this time, there were more B-25s available for South Pacific duty because it had been decided to send the B-26 Marauder to the Mediterranean theatre. Consequently, it was decided to adopt the B-25 as the standard medium bomber for the entire Pacific theatre, and to use the B-26 exclusively to Twelfth Air Force in the Mediterranean with some later being used by Ninth Air Force in the European theatres.
The B-26 Marauders had a terrible breaking in time when first introduced to the U.S. Army Air Forces. The wing on the 26 was so short that it was called a number of names. The B-26 was not an aircraft for novices. Unfortunately, due to the need of training many pilots quickly for the war, a number of relatively inexperienced pilots got into the cockpit and the accident rate increased accordingly. This occurred at the same time as more experienced B-26 pilots of the 22nd, 38th and 42d Bombardment Groups were proving the merits of the bomber.
For a time in 1942, pilots in training believed that the B-26 could not be flown on one engine. This was disproved by a number of experienced pilots, including Jimmy Doolittle.
In 1942, Glenn Martin was called before the Senate Special Committee to Investigate the National Defense Program, or Truman Committee, which was investigating defense contracting abuses. Senator Harry Truman, the committee chairman, asked Martin why the B-26 had troubles. Martin responded that the wings were too short. Truman asked why the wings weren't changed. When Martin said the plans were too far along and besides, his company already had the contract, Truman's response was quick and to the point: In that case, the contract would be canceled. Martin said corrections to the wings would be made. (By February 1943, the newest model, the B-26B-10, had an additional 6 feet (1.8 m) of wingspan, plus uprated engines, more armor and larger guns.)
Indeed, the regularity of crashes by pilots training at MacDill Field—up to 15 in one 30-day period—led to the exaggerated catchphrase, "One a day in Tampa Bay." Apart from accidents occurring over land, 13 Marauders ditched in Tampa Bay in the 14 months between the first one on 5 August 1942 to the final one on 8 October 1943.
B-26 crews gave the aircraft the nickname "Widowmaker". Other colorful nicknames included "Martin Murderer", "Flying Coffin", "B-Dash-Crash", "Flying Prostitute" (so-named because it was so fast and had "no visible means of support," referring to its small wings) and "Baltimore potato" (a reference to the city where Martin was based).

When Martin aircraft company made the changes, the B-26 became a much more docile aircraft and was a lot easier to transion from pilot training schools into the multi-engine aircraft. The U.S. Army Air Forces needed bomber pilots and lots of them!

This is a pic of the final version of the B-26.
The B-26 Marauder was used mostly in Europe but also saw action in the Mediterranean and the Pacific. In early combat the aircraft took heavy losses but was still one of the most successful medium-range bombers used by the U.S. Army Air Forces. The B-26 was initially deployed on combat missions in the South West Pacific in the spring of 1942, but most of the B-26s subsequently assigned to operational theaters were sent to England and the Mediterranean area.
By the end of World War II, it had flown more than 110,000 sorties and had dropped 150,000 tons (136,078 tonnes) of bombs, and had been used in combat by British, Free French and South African forces in addition to U.S. units. In 1945, when B-26 production was halted, 5,266 had been built.