Transporting Diplomats

How can I transport a diplomat over water. I have attempted to load a single unit on both a fire trireme and a ship of the line with no luck. Help please!

[LandBuilder]

those two ships are military only. carracks, troop ships etc can transport all types of units.

[Savant]

I ran into this "problem" last night. Over and over again I was trying to load a knight onto a Coracle and I must have gone through 3 turns before I realized what was going on. I had forgotten to unload a unit I had on the coracle before and so... well, duh.

Might be your case too so check to see if you have a unit already on it that prevents you from loading more.

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'Blood will run'