Note 3 — Chapter VII · Southern Leyte Valley: Part One

The 16th Division made use of the caves on Catmon Hill for shelters, artillery positions, and supply dumps, and established well-concealed coconut log pillboxes and observation posts at numerous vantage points on the hills. Some of these pillboxes, with good fields of fire and spider holes, were emplaced in positions to cover the roads.3 A spider hole was dug about five feet deep, sometimes camouflaged with a removable cover, and was large enough to contain a man and his weapon.