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Yulin Town
Can the "little poplar" guard the border? The Song Dynasty planted trees on the frontier to block the Khitan cavalry, which really had an effect
Song dynasty
Small poplar
borderland
Khitan
Yulin Town
Monty
12-18
![Can the "little poplar" guard the border? The Song Dynasty planted trees on the frontier to block the Khitan cavalry, which really had an effect[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)