One of the major idiot mistakes I make most of the time is neglecting defense in favor of city improvement. I was playing as Bismarck (since I find Industrious and Expansive a good trait combination and come from Germany anyway) on a Noble Continental map and was hemmed in by three civs - Saladin was in the West, Vicky was in the South, Isabella was in the South East. Centurys ago I had already wrested two cities off Isabella's realm and was now entering the 20th century. I was thinking: Hey, let's just skip building riflemen for city defense - Assembly Line will come in 7 turns anyway. This proved to be a major blunder. I had barely finished the Pentagon in my best production town and was setting up Infantry production for city defense purposes at last, when I heard that dreaded War Declare horn. Saladin - who had always been pleased with me - hat mustered two stacks with a combined 20 cavalrys, a stack with 7 infantrys was already on the way to my border. I spent all my money on upgrading my macemen to infantrys, but I couldn't withstand. Then I heard another horn sound and thought hopefully: "Hey, good ol' Vicky is gonna help me out !". Yes, Vicky was declaring war - but on me !!! She had been as pleased as Saladin with me, but she thought she oughta have some pieces of the cake for her own. Why not, it was easy going.
Will I ever learn that the AI takes every chance it sees ? Will I ever learn to muster such forces that I can withstand ? Will be interesting to see in the future...
Regards,
Lord Timon