Yesterday and day before, I went on a naval robbing operation. This involved sending COGS and troops to an ally port some distance away from me but on the same shore line. So far so good. I scouted a city in the interior to rob and it looked easy, so I sent my army from the ally port to the rob city and captured 18K in resources. However when my army got back to my allies city, the resources they were carrying disappeared and my army went home on the COGS to my port EMPTY? I could have sent them home overland but the journey is over a day. As it was the operation took 26 hrs to complete using COGS! My question is WHY did the system strip me of my resources?