Roman army of the mid-Republic x 700m = ca. 50 hectares). Along the perimeter, a ditch ("fossa") would be excavated, and the spoil used to build an earthen rampart ("agger") on the inside of the ditch. On top of the rampart was erected a palisade ("vallum") of cross-hatched wooden stakes with sharpened points. Within this precinct, a standard, elaborate plan was used to allocate space, in a pre-set pattern, for the tents of each of the various components of the army: officers, legionary infantry (split into "hastati", "principes" and "triarii") and legionary cavalry, Italian allied infantry and cavalry, "extraordinarii" and non-Italian allies. The idea was
Picket fence without blocking views, and are used around both front and back yards. Traditionally picket fences were made out of wood and painted white (or whitewashed), but now picket fences are also widely available in polyvinyl chloride (PVC). Until the introduction of advertising on fences in the 1980s, cricket fields were usually surrounded by picket fences, giving rise to the expression "rattling the pickets" for a ball hit firmly into the fence. A picket fence is generally tall. A horizontal top rail and bottom rail are attached to fence posts, which are installed upright into the ground. Evenly spaced boards are