Which preposition to use with erzerum

in Occurrences 2%

In spite of the need for troops one half of it was sent from Bagdad to Erzerum in the depth of winter, without any provision of warm clothing.

to Occurrences 1%

Corroborative and additional evidence is given by the Danish Red Cross nurses who, with a noble disregard of their own safety, accompanied one of these caravans from Erzerum to Erzinjan.

Which preposition to use with  erzerum