The Golden Spider by Francis Lynde

After the first burst of wrathful astoundment at finding their camp wrecked and looted, the three victims of whatever fury it was that had visited the gorge in their absence began to count up their losses.

It was the food losses, of course, that were the most serious. Purdick, in his capacity of camp cook, knelt to gather up what he could of the scattered flour and corn meal, but there wasn't very much of either that could be salvaged. While Purdick was trying to save some of the eatables, Larry and Dick reassembled the scattered dunnage and camp equipment, endeavoring to make some estimate of the length and breadth of the disaster.