Historical Myths

A quick Google search pulled up this site, which says no man's land could be anywhere from a couple hundred yards wide to a kilometer wide.  I suppose the first question is what sort of distance is the sniper looking across.  A decoy that can fool a sniper at one kilometer may not be able to fool one at football-field distances.

In WW1, or "The great war", there were snipers, this we know.
How far away?.. enough to be confused by what is real, otherwise, the dummy would not have been used.
And of that dummy, it was "Mobile" by all accounts.
It was not just some scarecrow to be plated and forgotten, it was put up in obvious observation points, and moved on a regular basis, to "entice" snipers from the opposing side, where another better disguised observer would look for the tell-tale puff of gunfire to spot the sniper.

Another myth is how unlucky it is to take third light on a cigarette.
This stems from the same myth of Snipers.
If someone lit a cigarette, it sort of shows up as a glare, first light, spot the enemy, second light, align target, third light "Fire", so it is now considered unlucky to take third light on a cigarette...

Perhaps that can be tested in how long it takes a sniper to observe line up and fire at a target in dim light and indeed of taking third light could be about the timeline average it takes for the sniper to take a pot-shot.

There are plenty of myths from old battle lines that could be put to a test here, almost a whole shows worth.

According to the book 'Churchills Wizards The British Genuis for Deception 1914 to 1945' the heads used for envoy dummies were supplied by a theatrical costumier called Clarksons.
The head was set up on a stick and slide up and down on a grooved board, if hit by a snipers bullet it would be examined by inserting a rod through the entry and exit holes o determine the direction of fire. Or at the same time as the head was pushed up use a periscope .
Having said that it was not something that the everyday Tommy did, but were tactics developed and used by expert counter-sniper teams who were specially trained for the task.
Later models made by the French included the ability to 'smoke' a cigarette through a rubber tube

In the same book it is stated that the Germans deliberately made their trench look disordered as it made finding their snipers more difficult, with odd coloured sandbags, bit of old iron, tins etc distracting the eye, where as the ordered British trenches made targets stand out far more easily.

Assume the Bothan is aware of myths that have been posted on TC before, and the most needed for those would be to just note what the myth was. The Bothan is quite capable of finding the original thread from that.

Myths; At the beginning of WW2 the British army used a mammoth .50 calibre anti-tank rifle; It was later rechambered for the SMALLER .50 BMG.

According to reports not only was this gun incapable of doing more than denting the side armour of a Panzer*. But proved to be more dangerous to the user than the target, with men shattering their collarbone and/or dislocatijg their shoulder firing it. Even in the best case the user was so badly stunned they had to be dragged out of the firing line before the tank could return fire.

(*Based on the date this was probably the Panzer III, which was unusual in having the side and rear armour the same thickness as the front. This was, off memory, 50mm thick and even a modern .50BMG AP round can only manage 35mm. Although the Soviet Army had notable success with AT rifles, this was during city fighting where they were shooting from elevated positions at the much thinner upper deck armour.)