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The B-26 Invader was a larger, more ruggedly built version of the A-20 Havoc with more powerful engines, longer range, and heavier armament with remote power-driven gun turrets. It had a three man crew including a pilot, navigator and bombardier. It had the same high shoulder wing, but it was changed to a laminar flow design, the same type of wing that gave the P-51 Mustang its phenomenal performance. It was powered by 2,000 hp (1,490 kW) Pratt & Whitney R-2800s, which allowed it to pack more punch in the way of armament. There were many technological advances made during the war and the Invader took full advantage of them. One version had an incredible 18 forward firing 0.50 caliber machine guns. It remained in service for more than 25 years, while other light and medium bombers, such as the A-20 Havoc and B-26 Marauder, were scrapped as soon as the war was over. After World War II, the Invader served in Korea and Vietnam, making it the only American bomber to fly missions in three wars.

The Invader was designed to meet a 1940 US Army Air Corps (USAAC) requirement for multi-role light bomber for low-level and medium-altitude for precision bombing attacks, with heavy defensive armament. Three prototypes were ordered and the first XA-26A flew on October 31, 1941. It featured an advanced remote-controlled electrically powered dorsal and ventral turrets with each turret containing two 0.50 caliber machine guns. It had additional twin 0.50s located in the nose along with a glazed flat panel position for a bombardier. It also had the capacity to carry 3,000 lbs. (1,360 kg) of bombs and another 2,000 lbs. (900 kg) beneath the outer wing panels. The second prototype added Airborne Interception (AI) radar in the nose, four 0.50 caliber machine guns in the upper turret and four 20 mm cannons in a ventral fairing. With the introduction of the Northrop P-61, the A-26 night fighter version was never put into production. The third prototype had a 75 mm cannon mounted on the right side of a short solid nose with twin 0.50s mounted in the upper and lower turret.

The Invader came in some 700 lbs. (317 kg) below its designed weight and it was able to carry more than twice as many bombs than the USAAC requirement. Unlike the Havoc, that incorporated flaps that were slow to deploy and somewhat ineffective, the flaps on the Invader were double slotted and moved backward as well as down creating greater lift during takeoff and landing.

A lot of thought went into its defensive armaments and this caused some delays before production began. The first production attack version was the A-26B and it carried six 0.50 caliber machine guns, which was later increased to eight. There were two in the nose and two in each dorsal and ventral turret. The bomb load was increased to 4,000 lbs (1,815 kg) and it was powered by two 2,000 hp (1,490 kW) R-2800-27 or -71 engines.

Soon after going into service, the armament was increased for the ground-attack role. Eight 0.50 caliber machine guns were installed in under-wing blister packs. The upper turret was locked in the forward position and fired by the pilot. With eight 50s mounted in the nose, it had a total compliment of 18 forward firing guns. With its high speed and massive fire power, this was one hell of an attack airplane.

In the Pacific, the A-26 made its combat debut in July 1944 with the Fifth Air Force on New Guinea. The pilots in the 3rd Bomb Group's 13th Squadron, "The Grim Reapers", received the first four A-26s for evaluation and found the view from the cockpit to be poor for low-level attack. Visibility was greatly limited with the pilot positioned between the engine nacelles making it difficult to spot well hidden Japanese positions in the jungle. Forward-firing armament was also considered inadequate. General George Kenney, commander of the Far East Air Forces stated that, "We do not want the A-26 under any circumstances as a replacement for anything." Until changes could be made, the 3rd Bomb Group requested additional Douglas A-20 Havocs, although both types were used in composite flights.

In January 1945, the 319th Bomb Group was recalled to the United States and converted to Invaders from Marauders. When the Invaders returned to the 3rd Bombardment Group in the summer of 1945, clam shell doors were installed on the canopy replacing the greenhouse cockpit-thus greatly improving visibility. Armament was increased to include six internally mounted 0.50 caliber wing guns rather than drag-producing blisters and eight 0.50s were placed in the nose. They were assigned to the Seventh Air Force and flew missions from Okinawa, bombing the Japanese homeland and enemy bases near Shanghai, China. The A-26 operations wound down in mid-August 1945 with only a few dozen missions flown.

In Europe, Invaders began arriving in late September 1944 and were assigned to the 553d Squadron of the 386th Bomb Group. The first mission was on September 6, 1944 with no losses on eight following missions. This group was later moved to the Ninth Air Force.

The Invader was faster than the A-20 Havoc and the range and bomb load were greater, and the 416th Bombardment Group, of the Ninth Air Force, began replacing its Havocs and B-26 Marauders with the Invader in November 1944.

The A-26 was unsuitable for the low-level formation flying, but this was discovered the hard way. The 409th Bombardment Group received the Invader in January 1945 and showed, even with increased speed, low-level missions were extremely dangerous. On January 23, 1945, six Invaders were sent on a low-level strafing mission with M-81 fragmentation bombs. They were to rendezvous with P-51 Mustangs on the way to a target between Dasburg and Arzfeld in Belgium. They broke into three elements of two aircraft each and dropped their bombs on vehicles to choke the road into the town. They returned to strafe the vehicles again and were met with devastating ground fire. Five of of the six airplanes fell to the concentrated ground fire.

During March and April of 1945, the 386th and 391st Bombardment Groups of the Ninth Air Force converted to the Invader from B-26 Marauders and performed medium altitude missions with great success.

In Italy, The Twelfth Air Force, received the Invader and these were assigned to the 47th Bomb Group in January 1945. They were used against tanks and troop concentrations in the Po valley in the final campaigns in Italy, and against German transport links.

In the Mediterranean, the 47th Bombardment Group began receiving Invaders in January 1945 and were mainly used as night intruders and were successful at destroying a large number of vehicles that were forced to travel at night because of daylight attacks.

When World War II ended, the Invader remained active with some light bomb and reconnaissance units in the USAAF. In 1947, the US Air Force became independent of the US Army and deleted the designation "A" (for attack category). The Invader was designated the B-26, often causing confusion it with the Martin B-26 Marauder. Many Invaders were relegated to Air National Guard and Reserve Units, but it wouldn’t be long before the Invader would go to war again.

In January 1951, 111 Invaders were loaned to the French for use in the Indo-China war. After a cease fire in 1954, 85 airplanes were returned to the USAF. In 1950, the French also used Invaders in Algeria for counter-insurgency operations and a small number were used as night fighters.

In 1950, Invaders were called in for duty for the Korean War and participated in the first attack on a North Korean airfield at Pyongyang on June 29, 1950. Eighteen Invaders of the 3rd Bombardment Group destroyed 25 aircraft on the ground and also shot down a Yak 3 during the mission. The 3rd held the line until they were joined by the 452nd Bombardment Wing in October 1950. They were stationed in Japan until 1951, when the 452nd went to Pusan, and the 3rd went to Kunsan in Korea.

Invaders flew both low and medium-level missions attacking enemy troop columns, ground transports, and tanks. B-26Cs with the glass nose were used to lead the hard nose B-26Bs on medium-level missions against bridges, road junctions and railways. In the summer of 1951, one B-26B had an 80 million candlepower searchlight installed to illuminate ground targets at night, but this was discontinued rather quickly as the aircraft became an easy target for ground fire. In May 1952, the 17th Bombardment Wing was sent in to replace the 452nd. Invaders of the 17th and 3rd Wing were involved in the last combat mission in Korea on July 27, 1953.

When the Vietnam War began, war weary Invaders were once again called to service. As the war dragged on, Invaders were rebuilt as B-26Ks. The On-Mark Engineering Company performed the modifications and they were upgraded with 2,500 hp Pratt & Whitney R-2800-103-W water-injected engines. Fuel capacity was increased by adding tip tanks for longer range, and armament was upgraded. Three 0.50 caliber machine guns were installed internally in each wing and eight 0.50s were installed in the nose. It also had provisions to do quick nose changes for medium-altitude bombing or reconnaissance missions. They were primarily operated by the 606th Aero Commando Squadron and were based in Phanom Air Base in Thailand. They were retired in 1969.

The A-26 was the last propeller-driven twin-engine production bomber produced for the USAAF and was one of the few wartime aircraft types still in service with the post-war US Air Force. Douglas built 2,503 A-26/B-26 Invaders and the last US military Invader retired in 1972.