During World War I, soldiers made use of ingenious battlefield camouflage with the invention of the tree observation post. Engineers crafted highly realistic artificial trees, carefully designed to look like damaged or dead trunks, but inside they hid a secret compartment for an observer. These “trees” were stealthily installed—often replacing real ones under cover of night—so that a soldier could watch enemy movements safely and secretly from within no man’s land. This clever tactic gave armies

Russian Camouflages