CISCO.

According to Shrum's account, given consistently to investigators over decades, the figures attempted to dislodge him from the tree throughout the night. The robotic figure released a vapour from its mouth that caused him to lose consciousness briefly; he revived, and afterward began firing arrows from his bow at the figures. Two arrows reportedly struck the robotic figure with a metallic sound and apparently shorted out its lights. Shrum tore off and burned his clothing piece by piece — his cap, his vest, his jacket — to keep the figures at bay. At dawn the figures and the craft departed.

Shrum walked out of the woods the following morning and was reunited with his hunting companions, who confirmed he was missing his outer clothing and was visibly traumatised. He reported the event to the local sheriff and was eventually interviewed by Project Blue Book investigators at McClellan Air Force Base. The Blue Book file lists the case as "unidentified." Shrum passed a polygraph examination administered by the late MUFON investigator Paul Cerny, who became one of the case's principal independent investigators.

The Cisco Grove case is unusual for its high strangeness, its tree-bound, hours-long siege narrative, and its single-witness yet polygraph-supported testimony. It is included here because, despite the extreme strangeness, it survived multi-decade investigation by Blue Book and MUFON without producing evidence of fabrication and without a conventional explanation. Readers should weigh the strangeness alongside the lack of corroborating witnesses.