Hurdles: On Building Split-Rail Fences and Portable Fences

An expert on vintage (i.e.: pre-power tool) hand crafting techniques describes the process of building split-rail fences and "hurdles" or portable fences.

split-rail fences, portable fences - using a mortice axe
Once the mortice holes are bored, the fence-maker uses a mortice axe to chop away the intervening wood.
Roy Underhill