Placing units here and there (mostly nukes ) I decided to use some units I never use such as ships. And somehow, accidentally I put a ship on the land..... And it worked too!

It can't move, but it can attack adjustant units thinking they are on shore, and adjustant units attack my ship with the notice "german ship caught in dock".

One of the AEGIS i assigned to patrol Spanish shores... literally!

I had also put some ships in enemy cities, which made for a wierd effect. They could move out of them, but later got in just as easily without attacking the city.

Other units (such as howitzers) attacked the city after I moved them out and sent them back in.

My AEGIS cruiser parking inside of a Greek city, rendering it useless

What is wierd is that the AI, tried to reconquer the cities that had my units in them, even though they were really under his Control. And then, after finishing off my units, he continued to attack and kill his own units which he himself had fortified to counter my units. Wierd...

The AI units which were in the city when I added my immigran unit to it, stopped functioning and didn't budge. Though he had cruise missiles to use against me, the AI had given up hope on units that were sharing a city with me.

Any one else got these phenomenas or maybe found use for this?

It really struck me that ships can exist on land tiles, they're just aren't alowed to move on to land tiles.

He says:
"Ok I guess we need to restart"
I say:
"What?You're not going to let a little thing like not being able to deliver cargo get the better of you..."
He says:
"Grrrr...like I said,back out and we restart"

This allows a mechanism for fleets to move via 'canals' to different oceans and for their use as fairly heavy weight defenses inland

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Scouse Git[1]

What happened,IIRC, is that the city would still appear to be mine but any of my units in it would not function and if I tried to move a unit into the city it would treat it as enemy territory and attack.

I can't remember ever seeing the A1 try to move a unit in but from Sirotnikov's experience they probably would have been free to move in and out and would not have been able to attack (although whether all the A1 civs would be affected or only one is a question).

I didn't check whether I was getting the production from the city or not.

While monkeying around with barbarians (in cheat mode), I discovered that they really are barbarous. They spare no effort killing their own settlers! I even piled a horde of barbarians in squares adjacent one of my cities; They all dashed off to kill a barbarian settler 5 squares away. Only after he was dead did they resume their usual annoyances.

That said, I've never seen AI civs attack themselves.

Having nightmares from WWII? Forget it. You can't hold a grudge forever. It's better to forgive and forget.