Screw picket

Screw pickets are also used to stabilize small trees, tent poles, and other objects that are intended to remain upright.

In hard ground, it requires a second tool (a leverage bar, or a spare screw picket) or the availability of a length of wood.

Screw pickets (used as supports for barbed wire defences) were introduced c. 1915 as a replacement for timber posts.

Crown Iron Works Co. (Minneapolis, MN) made over 10 million of these screw post pickets for WW1, WW2 and the Cuban Missile Crisis.

A wiring party is described in detail in World War I novel All Quiet on the Western Front by contemporary author Erich Maria Remarque.

A wiring party with shovels and screw pickets.
A soldier using a barbed wire anchor spike to screw in a picket at Fort Belvoir , Virginia (August, 1942)
Barbed wire picket