Triremes have a defense strength of 0. This means that any attack to a Trireme will be successful as it happens on solid ground with Diplomats. That was what I thought. So, whenever I found an enemy Trireme I attacked. Since Triremes have an attack strength of 1, in a Trireme Vs. Trireme battle the offensive side always wins. However, I was surprised to watch a Trireme standing firm after being attacked. This particular enemy Trireme was carrying some units so my guess is that it was the units being transported that actually defended the Trireme. I always thought that units inside vessels (Triremes, Sails, Transports, Carriers) were inactive and could not attack or defend unless they were disembarked. I would like to know what you think about it. Is my guess correct or is there another explanation for what happened? If my guess is right, were you aware of this?