The no defensive pact thing is really quite stupid. And I see no possible explanation for it except that it's a bug in the new patch. One after another, as they say
Gifting Nappy units to help him survive was indeed a viable idea. But looking at the number of units that Saladin has at his disposal, it was a dangerous situation. If Nappy had not lost Numidian, he could simply lose a city elsewhere or lose a large number of units, which would severely weaken him. I did not want Saladin to be in a better position to crush Napoleon later on at the end of the war. Also, we had very few units to spare. And, besides, I thought with peace we could sign a defensive pact with Napoleon, but for some reason that turns out to be impossible.
Well, we do have a significant military tech lead on Napoleon. We have Industrialism and Artillery on him. All we need is Combustion to produce tanks. Saladin, though, remains a big worry, IMO. He's the vengeful type, in my experience (you know, the whole holy struggle and past golden age thing
). We have an even bigger tech lead on him, but he has loads of units. His human wave attacks would be enough to overwhelm us. I second the idea of building lots of Artillery for defense.
Anyway, I'm tempted to go for Combustion next and then Radio, Computers/Plastics and Robotics. How about Flight? How important is aircraft for our defense? Having bombers to bomb invading stacks would be great, but that might deviate a little too much from our main research goals.
Anyway, getting Space Elevator is also a matter of denying it to the AI. I've had quite a few close space races where my ability to finish all the parts a few turns earlier was all that got me the wins. If the AI was the one who had the Space Elevator, I'm sure those games would have been lost.