In fact, Liu Tie didn't bring many airships from Yuguan City. Now, two more need to be set aside to guard Qingwu County and Gouwu County, so the airships are already insufficient.
However, the discovery of the coal mine was a major event, and after Mr. Tian finished writing the letter, Liu Tie immediately arranged for an airship to deliver it.
The next morning, the airship delivered the letter to West River Bay.
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