Some information on the unit from my archive... Any additional information is of course very welcome !
On the 11th March 1917 the Seeflugstation F1andern U at Oostende became a fact From that moment on the Seeflugstation F1andern I at Zeebrugge would become also known as the Holland Staffel, because they were to operate in the most northern part of the area after the repartition of the operating area.
Works at the Oostende 'Spuikom' seem to have started at the end of October 1916. By March 1917 the unit could tell everyone they were operational. They were equipped with a pane hangar, a harbour crane, a downward slope to let the seaplanes in the water, which can still be seen today.
As already referred to with the seaplane base at Oostende becoming operational, tasks were re-divided between the Seeflugstation units.
Zeebrugge became responsible for the area called the 'Hoofden', this being located between the Dutch coast off Scheveningen over the Channel to Yarmouth, going down the British coast to the mouth of the Thames river, going in a straight line back to Zeebrugge. 0ostende received an area from the mouth of Thames river down the coast to Ramsgate going from there back to Oostende also in a straight line. They had to control all shipping traffic, enemy U-boats, minefields, navigation boys, barrage nets, etc. They also were responsible for reporting all changes in positions of these. Of course the ot her tasks such as attacks on enemy blockade ships and defence of the area against enemy aerial units.
00 the 11 th March the unit was officially established as already mentioned and CO became Kap.lt. Bücker. The unit started with 4 seapanes,5 pilots and about 100 men personnel.
Already 00 the 14th March the unit had it's first official victory. ft seems to have been a French flying boat However the unit would become really successful in aerial combat from 191800.
Flugzg. matrose Kakolewski Christoph of Seeflugstation Flandern II, killed 01/05/1917
Collishaw filled in a CITAR on the 12th May for a Seaplane - he probably killed or wounded the observer, and disabled the engine - and then suffered a gun stoppage.
By the time he cleared the stoppage, the seaplane was gliding in to Ostende, and a couple of scouts coming out of Ostende persuaded Collishaw to break off.
So, being charitable, I suppose it could be classified as a "driven down".
By the time Collishaw's "Air Command" was published, he was saying that he saw the seaplane crash into Ostende harbour. Many authorities list this as one of his victories - I am afraid that at the moment, I regard it as one of his more dodgy claims.
In the KTB(War Diary) of See II(Seeflugstation Flandern II) based at Ostende there are some descriptions of air fights this day...
...One fit rather well Collishaw story....
"A/c 787 flown by Vzfmst Dyck was attacked at Ostende by two Triplanes. It was forced to withdraw the combat and dived away in a steep dive. The a/c thereafter landed.."
No hits was reported...so it seems that that Nr 1 is the choice in this case... 1) The enemy aircraft dived into the harbour entrance to make his escape.
11 June 1917. 4 single seaters take of from Oostende 1041 – Lt.d.R.d.M.A. Strang, 787 – Lt.d.R.d.M.A. Bachmann, 1044 – Vizeflugmeister Dyck, 1047 Flugobermaat Burgstaller. As demanded by the U-Flottille Flandern they try to shoot they boeys of the ‘Kanalsperre’ but while doing so, 1041 goes upside down and is completely destroyed. 1047 landed and took Strang on board and tried to take off again, but even after several attempts it does not com eout of the water. The plane would afterwards be taken to Dover by an english steamer who was on guard duty. It is not clear what happened to the crew…
Lt. Dyck Walter of the II Seefl Abt died 19th June 1917 Baby N1019 was flown by Flt Lt Graham on 19 June 1917 when he claimed to have driven down a seaplane 10 miles NNE of Nieuport. Some sources give this as Graham's first victory and Above The Trenches
gives this as being over Vizeflugmeister W Dyck (Casualties of the German Air Service gives the name as Ltn d R Walter Dyck) of Seeflug II who died of his wounds.