Question about Re-supplying Fields

[beet1e]

I have RTFM about re-supplying fields, but I am still unclear about how this works.

I tried to re-supply a captured field using a M3. I loaded field supplies, drove them to the field (not the town) and pushed them out. Nothing happened. No message appeared to acknowledge receipt of the supplies, and damaged field elements did not suddenly spring back into life. What did I do wrong?  Please explain how to re-supply a field, once it has been captured.

[Saintaw]

You ned to get a resuply vehicle from another field. If you take say, an M3 from A45, you won't be able to resuply A45.