According to our information (The Armenian Church of Iran) when Shapour the king of Sasanian moved
many
Armenians to Iran on 4th century, a part of them located at Khuzestan
which
they were living there until Arabs attack to Iran but a part of them
located
at Soltanieh which they kept their religion and nationality until
attack of
Mongols to Iran.
We know that they had been strong community and they built churches but

there was not any evidence up to now.
After time being Mongols due to reasons moved them to Afghanistan and
Mongolia. The group of them how moved to Mongolia massacred after time
being
but the group who moved Afghanistan located at Ghandahar and they built

their church there which was destroyed by Taleban.
Sultan Hamid of Ottoman Empire wrote two letters to Naser Eddin Shah of
Iran
and amir of GHandahar to massacre Armenians look like him. The king of
Iran
did not pay attention to his letter but amir of Ghandahar follow up his

request. The group of Armenian how survived from massacre, escaped to
Kashmir which I do not have information about them.