Dou Jiande led more than 100,000 troops, and the cost of grain and grass for the army alone amounted to a thousand gold, and the prices of the army garrison skyrocketed, but it still could not meet the daily needs.

In view of this, Dou Jiande ordered people to rush back to Hebei to raise grain and grass.

At this time, the Yellow River had thawed, but the army was numerous, the cost was huge, and it was thousands of miles away from Hebei, so it was quite difficult to transport grain.

Boats, mules, horses, porters and bicycles, all go into battle together, and this journey will take at least seven or eight days......

Li Shimin has always been good at robbing grain, and he sent Tang general Chen Mingzhen to lead 5,000 elite soldiers to loot the grain and grass of the Xia army, and captured Zhang Qingte, the general of the Xia army.

Dou Jiande learned that the military rations had been robbed, and he panicked. However, the grain and grass transported from the waterway were all burned by the Tang general Wang Junkuo's boats.

When the army saw that the food and grass were delayed, the army's morale began to fluctuate.

More than a month has passed in the blink of an eye, and Dou Jiande tried to attack several times, but he was unsuccessful because of the steep terrain of Wujiao Pass.

The soldiers could not advance, and they could not eat enough all day long, and the hearts of the people began to think of returning.

At this time, Ling Jing of the Guozi Sacrifice Wine suggested: "The army has been trapped in the military prison for a long time, and it is not a way. It is better to cross the Yellow River in the north, enter the east of the river from the mouth of the well, occupy Shangdang, Fenyang, and Weizhen Guanzhong. There are three advantages to this strategy, one is to ensure victory; the second is to expand the land and win troops; Three are the vibrations in the pass. In this way, Li Shimin will inevitably withdraw from Guanzhong, and the siege of Luoyang will be relieved. ”

This was a strategy to save Zhao from Wei Wei, and Dou Jiande's wife Cao greatly appreciated it and persuaded Dou Jiande to act accordingly.

It's just that Dou Jiande was repeatedly defeated by Li Shimin, and he was not convinced, and the generals around him accepted bribes from Wang Shichong's envoys, and they were bound to fight with the Tang army under the Wujiao Pass.

In this way, Dou Jiande rejected this excellent plan.

When he learned that Dou Jiande had rejected Ling Jing's plan to cross the Yellow River north, he knew that the final battlefield would be on the field east of Wugao Pass.

At the time of the expedition, Li Yuan gave Li Shimin the power to build the banner of the Son of Heaven in the eastern part of Shaanxi, and all the Tang Dynasty soldiers and horses east of Tongguan were all mobilized by him.

Since the expedition, Li Shimin used the Great Seal of Xingtai for the first time, and he issued a secret order to mobilize the soldiers and horses of the Tang Dynasty that had been lurking in Funiu Mountain, Bear's Ears Mountain, and Taihang Mountain......

Soldiers and horses from all walks of life went out day and night, marching secretly, forming a fan-shaped encirclement with a radius of nearly 100 miles on the periphery of the Chenggao Field.

Li Shimin repeatedly emphasized that the march should be secret, and once the enemy army discovers it, it will be executed!

The net has been swept, and Li Shimin is waiting for the day of the decisive battle......