Smuggling drugs into the U.S. has become a complicated and high-tech affair. But a group of Mexican drug runners recently applied an 8th-century approach to their profession, using a homemade, trailer-mounted catapult to hurl bales of marijuana over the border.

Mexican soldiers, tipped off by U.S. National Guard troops monitoring the area with surveillance cameras, seized a few dozen pounds of marijuana, a sport-utility vehicle, and the catapult it was towing near the small town of Naco near the Mexico-Arizona border on Friday. The smugglers had already fled the scene.

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The catapult was found about 20 yards from the fence, standing roughly ten feet tall and prepped to launch several 4.4-pound bales of pot into the United States. And from what we can gather from the few grainy photos available, it looks like a legit piece of elementary medieval siege weaponry.

Most puzzling is how to classify the lobbing of bulk marijuana across an international border using a machine of not-so-modern warfare. While it doubtless runs afoul of U.S. drug laws, from a diplomatic standpoint is this considered an act of war or a foreign aid package?

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Wind and Release: The medieval marijuana slinger is capable of hurling 4.4 pound bales of pot over the U.S.-Mexico border fence.

This post originally appeared on Popular Science, via Reuters