1300 AD (pre-turn)
I dial up the Netherlands and ship him coal to get horses and $50.
Any attempt to steal from another AI isn't worth it as we could loss the ability to keep them at war. I deal up the Aztecs and ship them $2,748 and $17/turn and get Electricity. I then see why the Zulu are the only one hurting. They are the only other civ lacking Replaceable parts.
(IT) One Sumerian tank commits suicide at Bactra.
The MPP with the Aztecs expires, and I let it. As long as they are fighting Sumeria we don't need it.
1315 AD
Well I see good news that the Netherlands have active infantry.
I just noticed we failed to sign trade Embargoes vs. Sumeria. If the AIs sign peace we still keep any luxuries from going to Sumeria so I sign them with the world.
(IT) GACK - The Zulu and Sumeria sign a peace treaty.

A Sumerian BOMBER attacks Bactra.
Again a Sumerian tank commits suicide at Bactra. I guess size 12, across a river and fortified is tougher then it seems.
1320 AD
I give the Zulu $115 for an MPP.
I finally get Gordium up to 20 shields / turns to speed up production.
(IT) As I hope the Zulu are back at war when the first Sumerian tank crosses our border.
The second tank actually kills a rifleman in Bactra.
1325 AD

I don't remember seeing a Netherlands and Sumerian peace treaty popup. I checked back and the WERE fighting in 1320.
The MPP is expensive at $27/turn with the Dutch, but the alliance was over twice the price!
I had to try, but out elite AC failed to kill the 1 hp tank. Our elite immortal does, but no leader. I have to try for a chance for a cavalry army.
We are now starting to suffer from WW. No luxuries are available, so I have to up the luxury rate to 10%.
(IT) The Netherlands are back in the fight.
The Netherlands and Zulu sign an MPP.
1330 AD
I kill another tank with an elite immortal, but once again no leader.
I sacrifice our last AC to pillage the connection between us and Agade.
I have another tank to kill and...
Want to guess what we now have?
1335 AD
The bad news is that is a replacement as our healthy army failed to kill a single infantry. I can usually kill a couple infantry with a cavalry army.
1340 AD
We clean up a 3 cavalry and 1 infantry landing behind our lines without loss.
WW goes up again and luxuries are to 20%.
(IT) The Sumerians land a single tank behind our lines that the Aztecs kill for us.
1345 AD
I buy furs from the Zulu for $11/turn.
1350 AD
I have no idea why Sumeria ignored our 2 explorers that went to pillage wines. I have them pillage 2 more squares.
Summary:
I performed a decent defensive war, but it still looks bad. Sumeria has over 50000 culture points gaining 588 / turn. They are clearly double everyone else.
Sumeria WINS a culture victory in 49 turns.
They also are at 42 / 43 toward domination.
I got us one step closer to infantry, but the Zulu won't get replaceable parts to lower the price. The Zulu are LOSING the war and need to build some infantry.
http://www.civfanatics.net/uploads8/5CCR-1350AD.zip