Along the line of the Sereth, and in the Bukovina, deadlock was reached in the spring of 1917.
Late in the afternoon the Germans forced their way forward from Tarnopol to as far as the Sereth bridgehead.
I have examined the map and find that the river most suitable for the Slovaks to have ascended is either the Pruth or the Sereth.
The invading troops swept on, crossed the Sereth river, and soon gained control of about one-half of Roumania's western frontier.
Of course it may not be either the Sereth or the Pruth, but we may possibly investigate further.