from The Century Dictionary.
- noun A team consisting of three horses or other draft-animals, two of which are at the pole while the third leads.
Sorry, no etymologies found.
In single file they crept through the prepared opening in the barbed-wire entanglement, and so out into No Man's Land, where they took up their spike-team formation.
For three men, what you want is a spike-team -- middle man crawls ahead, other men follow on each side just near enough to touch his left heel with right hand and right heel with left hand -- a triangle, see?