Reposting from lb - slammed by Q post

>>5449601 lb

KEYSTONE = failed Russia attack?

Keystone in German = Schlußstein

WW1 - OPERATION Schlußstein - German naval attempt to occupy St Petersburg. (Muh Russia) was aborted

Then on 28 Oct through 2 November, 1918 —

A German naval mutiny

Read about it here: https://en.m.wikipedia.org/wiki/SMS_Thüringen#Subsequent_operations

Dates are very interdasting.

Q often pointing us to watch the water, talk of submarines. Military planning.

A possible answer for the KEYSTONE question?