I know the following DF existed at the start of the war:
DF 1: I class (Acheron)
DF 2: H dlass (Acorn)
DF 3: L class (Harwich Force)
DF 4: K class (Acasta)
DF 5: G class (Beagle) Med.
DF 6: F class (Tribal) Dover (Patrol)
DF 7: Humber (Patrol) mixture of A (surviving 27 knotters), B (4 funnel) & C (3 funnel), D (2 funnel) 30 knotter classes & E class (Rivers)
DF 8: Firth of Fourth (Patrol) as per DF 8
DF 9: Tyne (Patrol) as per DF 8
By Jutland, DF 3 had become DF 9 and the M and repeat M classes had formed (or were forming) DF 10, 11, 12 & 13.
My questions are?
1. Does anyone know when DF 3 was re designated DF 9
2. Was DF 3 reformed from other DD
3. What happened to DF 7 & 8