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Siegfried Abraham had 5 confirmed sinkings and 4 confirmed Damaged ships. A number of attacks were broken off because of heavy Flak and in these cases, when the torpedo had been dropped, the result was not seen.

Abraham participated in what was considered the last major success of the German bomber arm of the war . This roughly translated report from Major Klümper describes the attack on the convoy

Due to the short range of the torpedos we had to release them very close to the enemy ships. A height of 40m had to be kept and the speed could not mount above 180KM/H.
Keeping this low speed was a distinct disadvantage as it was done within reach of the enemies fire. As soon as the torpedo was released we had to gather speed and skim over the bow of the ship as this offered us the best chance to escape the enemy fire as we evaded their fire.

The He111s arrived in the target area in 4 waves, 1000meters between waves. We flew low over the sea, 3-4 meters on average. Keeping about 5 sea miles from the Spanish coast we reached Cape Gata . Once South of Almeira I made out the convoy through my binoculars. The 1st and 2nd waves swung southwards and formed a line while the 3rd and 4th waves joined to form a second line about 1000m behind the first.
The two waves, each 20 Aircraft strong approached the convoy. The hoped for dusk was not yet there, we could however not wait, we had to attack at once and make the most of the surprise effect. The ships were now clearly visable and a cruiser to the west of the convoy opened fire on us with its heavy weapons. At the same time the convoy noticed us and opened fire with a wide range of anti aircraft guns.
We had to increase our height as the cruisers heavy guns were throwing up water spouts that made low level flying impossible. One we entered the range of the light and middle weight flak the heavy guns became silent. The following attack was carried out under murderous anti aircraft fire. We had to dodge the flak until we had broke into convoy, drop our torpedos, and continue straight through to make it out the flak on the other side of the convoy. This had the advantage that we did not have to do a 180 degree turn, offering ourselves as targets to the enemy flak once again.

The official Wehrmacht report said
In the evening of the 13th August a German Torpedo Geschwader under the command of Major Klümper attacked a strong convoy entering the med east of Gibraltar. In a bravely executed attack our crews scored 32 hits on enemy ships. 2 destroyers and 4 extra Large supply ships were sunk right away, eight other ships started to burn brightly, the results of the other hits could not be observed due to the heavy Flak. Recon confirmed the sinking of at least 170 000 tons. 7 of our aeroplanes did not return.

This was the last major German Bomber success of WW2 and Major Klümper was awarded the knights cross for it.

Abrahams log book shows a hit on a 10-12 000 ton Passenger/supply ship with damage to the ship. Due to flak damage he had to ditch his plane, none of the crew was injured.

Above is the entry in his Leistungsbuch for the attack on another convoy where he sunk a 4000 ton ship. Both he and his observer were wounded.

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Before Abraham joined KG 26 they had been involved in the destruction of convoy PQ17 (see the pages called Naval Aviator) which Churchill called the biggest sea disaster of the war.

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