Yes, there was WARLORD TITAN in this battle. It was built by my friend who also has Imperial Guard and other Imperiums. It was 14,000 points per side battle, and we had to spend whole evening to finish this game. The map size was 14' X 8', and we had forest on one side and dense city area on the other side. We somehow had no men’s land divided along the edge of the city, and game began.
Here is the brief summary in battle:

Imperium side SA (Strategy Assets)
Flank March (Space marines)
Master of chapters (Four Assets provided)
Strategy redeployment

Chaos side SA
Flank March
Orbital bombardment
Strategy redeployment
Vortex grenade
Precision strike

Turn one Chaos side
-As soon as they saw waves of IGuard charging toward the wall of the hive, they started to shoot their heavy bolters and las-cannon. Many of the front lines of assault were killed, but Commissars led waves fearlessly. In shooting phase of the battle, many of the Imperial guards lost life, but armor column was unscathed.

Turn one Imperium side
- Long line of Imperial Guard army charged toward the great hive wall through no men’s land. Heavy weapon squads opened fire on all the enemies' Vehicles, destroying the fearful chaos land raider and IG renegade's tanks. Warlord titans thundered toward enemy’s hive, firing huge gatling blaster and volcano cannon. It caused great fear to Chaos.

Turn two of Chaos.
-realized that the titan supporting assault was main threat, large amount of chaos flank marched behind great warlord titan. The massive armor column appeared just behind titan and started firing. However, Space marines ambushed all of the flank marchers, wiping out one-fourth of the infiltrators. All the Chaos fire was concentrated to titan, causing little damage to assault waves. The Chaos was able to knock out all of titan's shields (6). Not much was done.

Turn two of Imperium.
The Chaos was shocked as ALL OF TITAN'S SHIELD WAS REPAIRED. Also, more of the IGuard reinforcements arrive in battle, appearing right behind the Chaos infiltrators, pocketing them between titans and wall of army. The assault wave continued, but Vortex missile from warlord titan ripped hive's main defense wall away, letting waves of IG army charging into hive without climbing the war. Flamers scorched anyone in its path, killed all of wall's defenders and started to take over the city. The warlord titan fired its great weapons, finally destroying all the armor columns of renegades. The Chaos retreated in horror as they saw the Warlord Titan.
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That's how game ended. If someone asked the question: Where are the Ultramarines?.....

Well... They were going to Flank March in full force at the third turn, but IG and Warlord Titan finished the enemy by the end of the second turn. So Ultramarines entered the hive without any damage. (I was playing Ultramarine, and I had no fun in this game..... sad )