Hi,
Concerning Sachsenberg :
Awarded the Pour le Mérite in recognition of distinguished naval service and leadership. The award was also given in recognition of his 15th aerial victory.
However there seems to be a difference with Osterkamp, just found the text :
Awarded the Pour le Mérite for distinguished military service and leadership. The award was also given in recognition of his 19th aerial victory.
Now on Christiansen :
Awarded the Pour le Mérite for outstanding leadership and successfull operations. Lt. Christiansen flew 440 flights against allied aircraft totalling 1164 flying hours, bombed Dover in England and rescued 27 survivors from a German ship sunk by the British. He was also instrumental in the capture of six enemy ships, working with German submarines, and shot down a British airship.
The recommendation for the award was the following :
Since 16 September 1917 he is Station Master/CO of the sea-fighting station Flanders. Since 12 February 1915 he has flown 440 flights against the enemy, his total flying hours are 1164. He has many air victories to record. He has dropped bombs on Dover, etc. He kept 27 shipwrecked persons, who met with an accident throught English monitors, with his squadron at the accident site over water until boats came to save the crew. Seven men still drifting in the water later were fished out by his squadron, and sheltered in the planes. He himself brought three of the men in his plane to Zeebrugge. Furthermore, together with U-boats he brought in five steam ships and one Dutch sailboat. Throught him five damaged aircraft and their crews were saved. In December 1917 he attacked an English airship off the coast of England, and destroyed it. Christiansen counts as the best and most successful German seaplane pilot.
If I'm not mistaken he was promoted to Kap.lt for the attack on the British sub C25.
Best from Johan