Ok so, I was starting a new CIV5 game Brave New World: Random Leader, on Continents, Standard map ( 8 civilizations with 16 city states ), on Prince difficulty, and with the standard resources and standard speed... I´m just starting every game in the same way because I like to discover and experience in different way every time I play from begining... The random leader was Enrico Dandolo from Venice, and the map was very good when I was starting: on a costal land in the south, near a river with some resources like fish, cows and jems. I just start to produce a scout to explore the land and I was producing in time some units and all that it needs the city to balance the happiness, money, food, production, culture and science. I was meeting the rusians in the north east , in the north the greeks and in the north west the germans, all nations very friendly with me. those was the nations with I was sharing my continent, despite of another 4 that I just did not have time to meet on the other continent. I just want from the start to work on a diplomatic victory , so the "key" was to improve the money from my "empire" (city), and the good relationship with the city states and the others civilizations. I was evolving with the city in borders and in technology , with the best ranking in money compared with all the civilizations. a good start. I was starting to make some units and put them on my borders to mantain some military power, to defence in case of barbarian invasion or some war with another civilizations... The increase of the money was too fast because I just have some merchants of venice like unique units and I was conducting them on special trade missions on some city states... (I just dont want to utilize the second ability of the merchants, to puppet city states because I was thinking to have them like allies , strong relationship to conduct the diplomatic victory.) So all fine, now the party starts: In the classical/medieval era the russians, greeks and the germans was asking me to accept embassy. so why not? then 3 turns later they asked if we can have a declaration of friendship? so why not? ok I will be diplomat why not, I want to be a very nice civilization.. and finnaly they asked me: open borders? allrighty then , yes I want that I am a city with a great trade route and I want those borders to not limit us... let´s do it to be a great influencial traiding city ( 5500 money +10 per turn) and to have a good diplomacy... OHHHHHHH F*** NOOOOOOOOOO!!! When we have open borders all 3 civilizations was entering my borders with some units and F***** me on being friendly and without any problems in the past... all 3 nations... and I was buying units making some tactical movement with ranged units and the melee combat but finally they plundered my territory and I cant stand battling in front of 3 nations with a lot of units ... My military was normal not so advanced but neither the AI... so finaly they was fighting who from all 3 nations will "eat" my rich city... and what was that? with just a city without posibility to just expand because you can´t have the ability to creat settlers you are useless in front of A.I not just in war but in expanding , to make a big score... you can´t... SO THE CONCLUSION IS....... what happened ????