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By 1957, newly independent Tunisia had become a major source of supply for the FLN. The French responded with the Morice Line, an elaborate system of sensors, electrified border fences, mine fields, and forts stretching the length of Algeria's eastern border. When an incursion was discovered, either by sensors or reconnaissance aircraft, B-26s and Aéronavale Privateers, Lancasters, and, later, Lockheed P2V Neptunes would attack the intruders continuously until helicopter-borne paras could arrive on the scene. The border fortifications worked reasonably well, but French authorities were aware that they could be easily breached by light aircraft. When air-defense radars at the Bône naval base seemed to show multiple tracks at low altitudes and low air speeds over the line, two radar-equipped MD-315 light transports were hastily despatched for night fighting duty. Predictably, they proved too slow and too short on endurance. The French then decided that they needed a special colonial night fighter. A small number of Invaders were thus converted and given the designation B-26N. The aircraft had British AI Mk.X radar (from French Meteor NF.11s), and an armament of two underwing gun pods, each housing two .50-cal machine guns, and two MATRA 122 pods for SNEB air-to-air rockets. By 1961, the B-26N fighters had intercepted 38 light aircraft and helicopters, downing nine.