Final answer:
The provided information describes soldiers with ornamented helmets but does not directly pertain to modern military practices concerning insignia of grade on helmets. Traditionally, insignia of grade are typically found on the uniform rather than on helmet decorations.
Step-by-step explanation:
The description provided suggests that the adornment of soldiers' helmets with horns or hedgehog-style protrusions serves a symbolic or functional role rather than denoting grade or rank. These decorations could identify different units or factions within an army or indicate the soldiers' roles. Since there is no mention of insignia of grade, it is not possible to provide a definitive answer. However, historically, insignia of grade is more commonly associated with uniforms or specific articles rather than helmet decorations, which might be more for intimidation or identification on the battlefield.