Outward flight The Heinkel He 111 took off from at 08:00 on 21 January but experienced bad weather, contrary to the weather forecast. The aircraft had been loaded with of fuel but the weather increased fuel consumption. Geissler had to use
dead reckoning and radio stations from which he could get a
direction finding (D/F) fix. Hours later, Geissler realised that he was more than off course and ordered a turn to the west to the
Chari River and flew along it to Fort Lamy at the confluence of the Chari and
Logone rivers where they join Lake Chad. The Heinkel reached the lake by noon, after which navigation became easier, despite the storm intensifying. At 14:30, flying at , the Heinkel reached Fort Lamy. Being so remote, the airfield and supply depot had no air defences. The Heinkel crew could not delay and made one bombing run. Sixteen bombs were dropped unhindered on the fuel dump at the edge of the airfield. The French forces were too surprised to fight back and of fuel and all of the oil were destroyed.
Return journey The Heinkel was undamaged and turned northwards but the crew knew that the detour made it impossible to reach with the fuel remaining. The engines were run at the leanest mixture possible and at to fly as far as possible. Wireless contact with the Italian support crew had been lost on the outbound leg and could not be re-established. At 18:00, towards sunset, short of , Bohnsack made an emergency landing on a high plateau. The crew of six men had of water remaining. Wichmann, the wireless operator, set up his 3-Watt wireless aerial, laying it out on tent poles. On 6,197 kHz (48.37 m), Wichmann managed to contact a wireless operator at the headquarters of in Benghazi, to the north. The Italian support crew was still out of contact and three days later, Benghazi sent a message that the Italians had been contacted and that they were searching for the Heinkel. On the fifth day, the crew transmitted a D/F signal with the Heinkel wireless, running one engine with the little fuel that remained, to power the wireless generator. Within the hour an Italian
Caproni Ca.309 () landed with water and melons for the Heinkel crew. On the next day a
Junkers Ju 52 from 1 (Desert Rescue Squadron 1) arrived with more water and fuel. The crew took off for the short journey to , where the Heinkel was refuelled and then the crew flew on to Hun. ==Aftermath==