A field fire that broke out Saturday in rural Alden Township is estimated to have burned about 80 acres, according to a news release from Hebron-Alden-Greenwood Fire Protection District Chief Thomas Linneman. The fire was deemed accidental after a small camp fire had embers blow into the corn field, Linneman said. Hebron-Alden-Greenwood crews were dispatched about 2:09 p.m.