Translation help with some letters, pow? kia envelope?

[joeimwalle]

Need some help with 3 feldpost items.
1. pow letter sent home i think dated 1917.
any help translating would be great.

[joeimwalle]

back

back page of letter.

[joeimwalle]

#2 french pow?

#2 french pow? letter postcard thats the top part of both scans.

#3 a kia envelope? maybe lt vladimir pospeloff???
thats the bottom of both scans

thxs in advance for the help
joe