Boris Gudenuf
Deity
Actually, the majority of helmets in 'regular armies' ( armies of Empires like Rome, China, Egypt, etc) had 'protrusions' - decorative feathers, fur, fronds, and such. In this category include the spiked helmets of the Prussians and Germans of 1870 - 1915 (and, for a historical footnote you never needed to know, the US Army Dress Uniform of the late 1870s which included a highly polished spiked helmet - an image of the Indian Wars no one ever needed).
BUT all of these were strictly decorative, or to make the wearer look taller to intimidate the enemy (include in this the towering 'bearskin' Grenadier's caps worn in Europe from about 1680 CE on). None of them included solid 'horns' or protrusions that would allow the enemy to knock the helmet off with a swipe of a spear, club or sword or, if the helmet were fastened on, jerk your entire head sideways. Decoration is one thing, and common. Decoration that gets you killed in your first battle was simply not done. The Horned Helmets were ceremonial and decorative, and therefore interesting headgear, but NOT combat gear.
AND they made an interesting 'graphic' so appear in a lot of illustrations: but I don't know of any such illustrations done by an any artist or purported artist who actually witnessed them being worn in a battle.
