I don't think the "sentry" feature works in 1.52. At least, it doesn't work the way the game says it should.
I am at war with the aztecs right now. I captured one of their tiny islands outside of their main island. I had a destroyer sitting on the coast with the sentry comand, thinking that it will attack, and destroy, any aztec galleon/frigate that comes within an adjacent square of my destroyer. Well, sure enough, one does - full of cavalry that can easily take back the city. The ship sails in, and unloads it's contents without ever even being aknowledged by my destroyer. Wasn't my ship supposed to attack anything that comes into any adjacent square... like the game states?
I also had a sentry failure when the aztecs first attacked me. I have a load of ships around my main island - all set in a way that they should attack any ship that comes near them - which will prevent any landings on my coast. Didn't happen. Their galleon cruised past my ships, unloads it's men, and leaves them to cause trouble.
I am at war with the aztecs right now. I captured one of their tiny islands outside of their main island. I had a destroyer sitting on the coast with the sentry comand, thinking that it will attack, and destroy, any aztec galleon/frigate that comes within an adjacent square of my destroyer. Well, sure enough, one does - full of cavalry that can easily take back the city. The ship sails in, and unloads it's contents without ever even being aknowledged by my destroyer. Wasn't my ship supposed to attack anything that comes into any adjacent square... like the game states?
I also had a sentry failure when the aztecs first attacked me. I have a load of ships around my main island - all set in a way that they should attack any ship that comes near them - which will prevent any landings on my coast. Didn't happen. Their galleon cruised past my ships, unloads it's men, and leaves them to cause trouble.