Willis Arseneau, 91, walked away near 27900 NE 174th Ave. in Battle Ground and is medically endangered with memory issues. Photo courtesy Clark County Sheriff’s Office – Willis Arseneau🎧 CCSO Searches for Missing 91-Year-Old Battle Ground Man Your browser does not support the audio element. The Clark County Sheriff’s Office is searching for a missing endangered adult. Willis Arseneau, a 91-year-old male, walked away between the hours of noon and 1 p.m. in the area of 27900 NE 174th Ave. in Battle Ground. Information provided by the Clark County Sheriff’s Office.