"This is something unique to me, a big man."

Liu Chan smiled and pointed to the trebuchet that was still firing wantonly in the inner city and said: "Those cloth bags contain lime powder."

Lime powder——

This is actually not a rare thing. This kind of technology actually existed in ancient times, but the popularity rate was not very high.

When he was in Chengdu before, Liu Chan refined a large amount of lime in order to make preserved eggs.

When he arrived at Tongguan this time, while checking the nearby terrain, Liu Chan found that there was a lot of limestone around, so he ordered people to transport the limestone back to Tongguan.

In the past few days, Liu Chan, in addition to paying attention to the developments in Luoyang and Guanzhong and strengthening the defense of Tongguan, was also producing lime in large quantities, because the lime production process is not complicated.

Limestone is calcined over high fire, and then the calcined limestone is dissolved in cold water. After a few days, a lot of lime powder has been produced in Tongguan City.

At this time, when Zhang He attacked Tongguan, lime powder came in handy. In order to prevent the lime powder from hurting the Han army in Tongguan City, Liu Chan ordered people to wrap the lime with cloth bags, but he did not wrap the cloth tightly.

.

When launched with a trebuchet in this way, the cloth bags will not open because the firing speed is too fast, but when the cloth bags slow down in the air, these cloth bags will open quickly, and the lime inside will immediately fall from the sky.

When a large amount of lime fell on the charging Wei army, did they still have any ability to parry?

……
Chapter completed!