Legio XXXVII Roman Docks (Location)
A Roman port in Marmarica.
Very few guards, treasure in the command tent.
You can sneak roof to roof to the tent, but you'll probably have to whistle out the captain for a clean kill (when inside, he tends to stubbornly face the wrong way). The bushes behind the tent make a good ambush spot.
Enter the tent and loot the red chest for completion.